Product description Designed for use in larger office buildings, warehouses or manufacturing facilities with signal shadowed environments, this tri-band gsm900 dcs1800 wcdma2100 cell phone signal booster offers 50db gsm/dcs/wcdma (890~915mhz / 1710-1785mhz / 1920-1990mhz) and 200 square meters coverage area. With it, you'll experience fewer dropped calls, faster data rates, and clearer reception. This cell phone signal booster device is featured with easy installation & operation, build-in indoor antenna and no interference. It could also improve indoor electromagnetism environments, protract cellular battery life and reduce radiation of cell phones, followed the replacement of gsm 900, gsm 1800, and wcdma 2100 network. Tri-band gsm900 dcs1800 wcdma2100 cell phone signal booster comes with everything you need to boost coverage in your area! this product is simple to install, comes with 100% free technical support. What are you thinking about? catching it and have it now! Specification Frequency range: --up link 890~915mhz/1710-1785mhz/1920-1990mhz --downlink: 935~960mhz/1805-1880mhz/2110-2180mhz Gain ( db):uplink gp50 downlink gp55 Export power (po)+17dbm Pass band ripple:3db I/o impedance: 50/n connector Noise figure:4db Transmission delay:0.5s Ambient temperature:-10?0 Power supply:ac110220v 4555hz Size: 220 x 180 x 20 mm Reliability: to the gb6993-86 standard Electromagnetic compatibility: to the ets300 694-4 standard Function: --a) power supply led denote --b) export power led denote Coverage area: up to 200m2 Accessories Indoor antenna Outdoor antenna Power adapter Coaxial cable 5m Coaxial cable 10m Indoor antenna accessories and screws User manual