Display device (for reference) The external power supply detecting normal display . Internal power supply detecting normal display . MMIC circuit detects normal display</br>-50dbm signal input and detection to achieve full displayed</br>Technique Specifications: Specification  Frequency Range:  Up Link: 890MHz--915MHz  Donw Link: 935MHz--960MHz Power: -70 ~ -40dBm/FA (1.23MHz)</br>Signal coverage area : 1.Support Maximum coverage area is 500 square meters. ( Depend on the area condition) 2.One indoor antenna only use for about 100 square meters. If want to make all use of 500 square meters which the host supports, need to add more indoor antennas (about6-7) and power divider / splitter.</br>2 years free warranty from Lightinthebox.com!!</br></br>Product Description</br></br>Specifications Repeater Frequency range (Mhz) UL 890-915Mhz DL 935-960Mhz Gain (dB) Up Link: 55Db ±3db Donw Link: 60Db ±3db Output Power (Bm) +17dBm/ ±3DBM Total Power RF Connector N -Female I/O impedence (Ω) 50 Ω Environment Conditions -10ºC-50ºC Dimensions (LxWxH) (CM) 13 x 10 x 2 General What's in the box 1 x User Manual - English, 1* Power Supply, 1 x Cable, 1 x Indoor Antenna, 1 x Mobile Signal Repeater</br><br/>http://www.amazon.com/gp/product/B016HP5YYI