The most powerful Dual band cellular amplifiers on the market with the best warranty (24 months). Cellphone Mate CM2020-80 Dual Band Universal In-building Amplifier/Repeater. The CM2020-80 is a high gain 80dB dual band repeater that extends cellular services in poor coverage areas by amplifying both transmit and receive signals. The amplifiers reduce problems with signal fades and dropped calls while improving voice quality, service range and access. These multi-mode amplifiers are designed to offer a cost-effective solution for use in buildings. Cellphone-Mate amplifiers are network compatible and enhance the cellular phone user's satisfaction without compromising the operation of the cellular system. This Amplifier-Repeater greatly improves signal strength inside a building when using your cellular phone. It does this without a physical connection to your phone, allowing you to walk freely during a call. It even allows multiple phones to be used simultaneously. The signal from the cellular tower is received by the outside antenna and then amplified and repeated to your phone through the inside antenna. When the phone transmits, it is received by the inside antenna and then amplified/repeated through the outside antenna to the cellular tower. The massive gain of the CM2020-80 repeater allows it to provide greater coverage area and more easily drive multiple interior antennas. Repeater includes AC power supply and mounting bracket. Easily scalable, most powerful amplifier on the market Reconfigurable, dual band, fits any size 80dB gain manually adjustable at 1 dB increments Features Automatic Shutdown to prevent overload Dual Band 800 and 1900 MHz Operates with CDMA, GSM, GPRS, TDMA, AMPS and all other standard cell phone networks Supports multiple users Uplink/Downlink Oscillation detection (individual LEDs) The CM2020 80dB is the most powerful dual-band amplifier in its price range on the market today. It extends cellular services in poor coverage zones where the signal is weak due to geographical area, building materials or structural design. This full-featured amplifier includes adjustable gain control for maximum flexibility to meet your location and building needs. Great for low signal and/or large coverage areas. It covers up to 80,000 square feet (with good signal). This amplifier is the perfect enterprise solution for a large office or warehouse. The 80 dB gain of CM2020 80dB make its coverage the largest in the industry. Package includes: CM2020 80dB Amplifier 9V AC Power Supply User Manual Velcro and screw mounting kit Outdoor and indoor antenna and 2 cables are required for installation (purchased separately). *Complete Kit is also available. Note: The inside and outside antenna must be separated by 125' at full power.