Functions: GPS Receiving Frequency:1227MHz,1575MHz System Gain:70dB(GPS Receiving Antenna 25dB; AT-555 20dB;GPS Transmitting Antenna 25dB) GSM UP Link Frequency:890-915MHz Down Link Frequency:935-960MHz Up Link Gain:40dB Down Link Gain:50dB Outout Power:+15dBm(3rd≥40ddBc) In-band Ripple:≤3dB Group Delay:≤1.5us Working Voltage:12V/1A DC Cable Mode The device working voltage by GSM output(12V DC) GPS receiving antenna by cable of GPS outdoor antenna(5V DC) GPS transmiting antenna by cable of GPS indoor antenna (5V DC) The outside shell for grounding(negative) RF Connecting:RF connector/N-50-K connector