Features 1. Works with CDMA 850MHz cell phone service providers. 2. Adjustable arms to fit most phones. 3. Boosts signals to and from cell tower. 4. Supports both voice and data. 5. Installs easily in any vehicle. Network Support Support CDMA, 850MHz and any wireless operator in the frequency range of 824-849MHz and 869-894MHz. Application areas It could be used in areas where there are CDMA 850MHz Network. It will help you stay connected in weak signal areas where there are man-made obstructions or natural obstructions How it works With the phone in the cradle and while using a wireless Bluetooth headset or hands free device, the outside Antenna collects the cell tower signal and sends it through the cable to the signal booster. The signal is then boosted by the booster and sent to the phone. When the phone transmits, the signal is picked up wirelessly and boosted by the booster and transmitted back to the cell tower through the outside antenna. Specifications Frequency range: Uplink 824-849MHz Downlink 869-894MHz Gain (dB): Uplink Gp?40 Downlink Gp?40 Export Power (Po): ?20dBm Pass Band Ripple: ?3dB I/O Impedance: 50?/N connector Noise Figure: ?4dB Transmission Delay: ?0.5?s Ambient Temperature: -10oC ~ 60oC Power Supply: DC12 ~ 24V Reliability: To the GB6993-86 standard Electromagnetic Compatibility: To the ETS300 694-4 standard Package Content 1 x R12 Cradle Signal Booster 1 x Outside Antenna 1 x Mounting Bracket 6 x Cradle Arm 1 x USB Cable 1 x USB Car Charger Adapter