Vktech GSM 900MHz Cell Phone Signal Repeater Booster Amplifier YaGi Antenna Kit A mobile phone repeater is ideal for house, home, office use. Frequency Range: Uplink 890-915MHz; Downlink 930-960MHz Gain	 Uplink: 58dB; Downlink 55dB Coverage: 100SQM Easy installation & operation, It could also improve indoor electromagnetism environments, protract cellular battery life and reduce radiation of cellphones