Features: 1.Built with pure cast-aluminum housing, amplifier main unit ensures high quality signals 3.4-level amplifier tube with double filters on amplifier board 4.Easy wiring and simple operation to its signal transfer device 5.No limit to the number of indoor GPS transceivers and maintenance-free 6.Larger Coverage Area: The maximum distance is up to 15m (Can be customized) Receiving Antenna: Frequency: 15755MHz + Beidou Polarization mode right circular polarization Antenna Gain: 3.5dB Amplifier Gain: 37dB Noise Factor: 1.5dB Reflection Loss: -14dB (SWR1.5) P-1: 10dBm Interference Suppression: 20dB (f0100MHz) Power Supply: 3V/5V DC Connector: SMA Mounting Way: Thread (M24X1.5) Connection Volume: Diameter 96 x 126mm Working Temperature: -45 to 85 Storage Temperature: -50 to 90 Humidity: 100%