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[Open Box] Cel-Fi DUO+ 4G LTE/XLTE/VoLTE Smart Signal Booster for Verizon

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Item Number: 6842



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This is an OPEN BOX ITEM.

Open box items may be customer returns or demo units used by 5Gstore; they may be missing packaging or other materials and may not include the original warranty or other manufacturer support or license plans. Read the below information carefully for details on the product's condition. All open items are sold AS-IS and are returnable within 30 days only if defective.

It contains all components and has been tested but may have slight cosmetic damage (scratches, etc) and are NON-RETURNABLE. The manufacturer DOES provide a standard 1-year warranty on open-box Cel-Fi units.

Fast Facts about this Product:

  • This repeater kit is best for: Verizon users looking for an easily-installed, powerful signal booster for areas up 13,000 square feet without needing to run cable or mount antennas outside.
  • Coverage area*: up to 15,000 square feet
  • All-in-One Kit? YES
  • Compatibility: This amplifier supports 4G LTE, XLTE, and VoLTE (HD Voice) for Verizon only. It is NOT compatible or approved for use with ANY other carrier. It will not help with Verizon 3G, and it will only help with voice/calling if you have HD Voice/VoLTE enabled on your phone and are in an LTE area. Read more about enabling HD Voice/VoLTE

Key Features:

  • Cel-Fi doesn't require the installation of external antennas, bulky coaxial cables, handset registration, or a configuration setup by the user. In fact, Cel-Fi intelligently and automatically senses and adapts to its environment-including to changes made by your carrier, or to changes caused by nearby equipment like Wi-Fi, or other Cel-Fi devices.
  • Cel-Fi provides coverage up to 15,000 sq. ft., making it ideal for large homes and offices. Multiple Units of Cel-Fi can be deployed in large offices and will not interfere with coverage strength.
  • Cel-Fi is radically different from traditional repeaters, Cel-Fi is the only intelligent booster that's wireless-in/wireless-out. The Network Unit receives the signal from the mobile network (it requires as little as one bar of signal) and relays it wirelessly to the Coverage Unit that amplifies it for up to 100dB of gain.
  • pdf download the Cel-Fi DUO+ datasheet
  • Stop by our warehouse in Cary, Illinois for a demo, as we have one of these set up and in use!

*Many factors will influence the actual coverage area you will see from a repeater, including layout/floorplan, construction, and original un-amplified signal strength. Depending on your situation, you may see more or less coverage than the estimates listed here. It is not possible to guarantee coverage area.

celfi pro install

Installation notes:

  • There must be at least one bar of usuable signal at the window in which you install the Network Unit. 

Features & Benefits:

  • Wirelessly linked Network and Coverage Units (5GHz U-NII band).
  • Peaceful coexistence with adjacent 802.11( 2.4GHz&5GHz), and femtocell devices.
  • Max EIRP: 10 dBm downlink per 5 MHz and up to 22 dBm uplink, per band.
  • Software-based optimization of integrated antenna coverage pattern which maximizes system gain and provides improved
  • Automatic Gain Control (AGC) based on real-time echo-cancellation.
  • Seamless call handovers between Cel-Fi systems and the macro network.
  • Subscriber devices enjoy improvements in battery life.
  • Bluetooth communications between a mobile handset and Cel-Fi via our Cel-Fi WAVE Mobile App provides software update
    capability and advanced information for technical support.
  • Adaptive signal equalization.
  • Includes Nextivity's 3rd-generation (ARES) chipset with 6 core processor.
  • Up to 3 cellular bands supported; relaying two simultaneously. Cel-Fi DUO+ boosts service for Verizon 4G LTE and XLTE only.
  • Supports E-UTRA bands 2(1900), 13(700) and 66(2100/1700)
  • Support for 3GPP Rel. 10 features.
  • Network-Safe software prevents uplink system gain from exceeding path loss between Network Unit and closest tower,
    thus eliminating unnecessary rise in base station noise level.
  • Uplink Muting Mode automatically shuts down uplink cellular transmissions when no active user equipment is detected.
  • Secure and ciphered provisioning for only Verizon’s channels based on network broadcasted PLMN ID.
  • Full Band Scan feature discovers newly deployed and re-farmed spectrum

Package Includes:

  • Network Unit
  • Coverage Unit
  • 2 Power Supplies
  • 2 Mounting Brackets
  • Quick Start Guide


  • RF Specifications:
    • Radio 1: Band 2
      • Frequency DL: 1930-1990 MHz
      • Frequency UL: 1850-1910 MHz
    • Radio 2: Band 13
      • Frequency DL: 746-756 MHz
      • Frequency UL: 777-787 MHz
    • Radio 3: Band 66
      • Frequency DL: 2110-2180 MHz
      • Frequency UL: 1710-1780 MHz
  • Environmental:
    • Operating temperature: 0° to 40°C
    • Storage temperature:-25° to 60°C
    • Relative humidity: 5% to 95%, noncondensing
    • RoHS II 2011/65/EU
    • WEEE (2002/96/EC)
    • ErP 2009/125/EC
  • Power:
    • 12VDC via external supply (two included)
    • External Supply: 100 to 240 VAC, 47-63Hz
    • Power consumption less than 25W per unit
  • Physical Specification:
    • Network Unit: 158.5 x 146 x 59mm, Weight 19.75oz.
    • Coverage Unit: 158.5 x 146 x 59mm, Weight 13.75oz.
  • Standards:
    • FCC Parts 15, 20, 22, 24, 27
    • EN 301 489 -1, 17, 23
    • EN 301 893
    • EN 301 908-1, 11, 15
    • EN 300-328
    • EN 62311
    • UL 62368-1
    • CSA C22.2#62368-1 IEC/EN 62368-1
    • 3GPP TS 25.143 Rel.10
    • 3GPP TS 36.143 Rel.10
    • EN 50566/62209-2/62479 (SAR) Bluetooth SIG

This is a CONSUMER device.
BEFORE USE, you MUST REGISTER THIS DEVICE with your wireless provider and have your provider's consent. Most wireless providers consent to the use of signal boosters. Some providers may not consent to the use of this device on their network. If you are unsure, contact your provider.
You MUST operate this device with approved antennas and cables as specified by the manufacturer. Antennas MUST be installed at least 20 cm (8 inches) from any person.
You MUST cease operating this device immediately if requested by the FCC or a licensed wireless service provider.
WARNING. E911 location information may not be provided or may be inaccurate for calls served by using this device.
Please note, the four largest carriers - AT&T, T-Mobile, Verizon and Sprint - and more than 90 regional carriers have given blanket consent for use of all boosters certified to the new FCC standards.

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All Reviews (1)

Only customers who bought this item from 5Gstore can write a review - these are all verified 5Gstore purchases

Date Added: 11/06/2018 by ERIC. (JEFFERSONTON, VA)
Open box item was priced well. Delivered quickly and packed well. Package contents were "like new". OK, This was a an incredibly easy installation. Followed all directions and I was up and running in 15 minutes. I receive 2 bars on a good day and was tired of dropped calls and long lag times to send a text. Although I was concerned that my phone was only getting 2 bars after installing the Cell-Fi, my LCID signal increased, my dBm signal increased and the control unit was showing a 3 bars! That range was a significant increase to keep my calls from dropping. By the way, I called the 3G store folks, they were friendly, helpful and knowledgable. This is a premium priced item, but well worth it. I've had the signal booster for close to a month with no problems. The android app is a little "twitchy", but useable.

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Q & A
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Will the Cel-Fi DUO+ work with 5G?

No, the Cel-Fi DUO+ only supports LTE signals.

Can an external antenna be connected to the Cel-Fi DUO+?

The Cel-Fi Duo+ does not support external antennas.

Are there any Cel-Fi kits that support more than 1 carrier?

No, they are carrier specific, which allows them to bypass the standard FCC rules that amplifiers fall under. This includes rules regarding the amplifier gain. While most amplifiers max out around 72db, the Cel-Fi kits max out at 100db. This increased gain not only results in a potentially stronger signal, but also to support much larger coverage areas (72db gain systems typically cover up to 6000 sq ft, while the Cel-Fi is capable of up to 13000 sq ft).

Can I use more than one Cel-Fi unit if I need to support multiple carriers?

Yes, unlike the traditional cabled kits from SureCall and weBoost, the Cel-Fi kits can be used in the same location without causing interference between the systems.

Cel-Fi Duo+ Quick Start Guide Download installation guide/manual

Purchasing this product gets you access to the following exclusive 5Gstore resources:
Cel-Fi: Installing multiple systems in 1 location
Cel-Fi: How to Register via Computer 06/07/2017
Cel-Fi: How to Register via Wave App 06/07/2017
Cel-Fi Duo+ (Verizon) Troubleshooting Guide 07/15/2016
Cel-Fi DUO+ - Enable VoLTE on iOS and Android 06/29/2016
Cel-Fi Wave Application 04/26/2016
Cel-Fi Pro Troubleshooting Error Codes 04/26/2016

If you already purchased this item from 5Gstore, Log In to the support portal to access these downloads.