Improve indoor cellphone communication, coverage area 30-100m2. Reduce radiation from cellphone, helpful for human health. Built-in AGE circuit, free of interference. Unique LED level indicators, easy to find base station. DIY kit, adequate accessories included, easy to install. SPECIFICATIONS ELECTRICAL PART Model No. SG40/45 Cell phone system GSM Frequency Range Uplink Downlink 890-915 MHz 935-960 MHz Bandwidth 25 MHz Gain (a) Uplink 40dB / Downlink 40dB [nom.] (b) Uplink 45dB/ Downlink 45dB[opt.] Gain Variation Over Freq. and Temp. 3dB Noise Figure Uplink 8.0dB / Downlink 8.0dB OICP-3 Uplink 34dB / Downlink 20dBm V.SW.R 2.0 : 1 RF Power Output Uplink 17dB / Downlink 3dBm Power Supply 90~240VAC 50~60Hz, 12.2VDC 1.5A[Max] Power Consumption 7W AGC Dynamic Range 20dB [Typ.] Spurious IMD -20dBm [Typ.] Level indicator 5 color LED indicators : Red: Orange: Yellow: Green: Blue Input Level Display Range -90~-60 dBm MECHANICAL PARTS Size Dimension 3.8x10.5x16cm [HxWxD]; 1.5x4.1x6.3in RF Connector Outdoor ANT side : F[F]; Indoor ANT side: TNC [F] Weight 0.5Kg [approx.] Case Alloy aluminum Installation Wall or ceiling mount or set on the tale Fastening 4 screw holes Operating Temp. -5o C~+45oC Storage Temp. -15o C~+50o REPEATER KIT UNIT AND PARTS (Includes): Main Unit. Exterior Unidirectional Panel Antenna. Internal Omni directional Antenna. Bracket and Mounting Screw set. AC Adaptor. 15m coaxial cable with pre-installed connectors. Additional F connectors for spare.