Product Description1. Support bluetooth hands-free phone calling via build-in microphone 2. Noise and echo suppressed by CVC technology to create the full duplex sound quality 3. Support mobile's A2DP Function. Play mobile music directly after connected by bluetooth 4. The function of connecting mobile automatically included 5. Support TF Card， music format can be MP3/WMA Feature: 1. Bluetooth Version: V3.0+EDR Class 2 2. Sensitivity:-42dB +/- 3dB 360round 3. Voltage: 5V +/-0.5 4. Working Current: 45mA MAX 5. Standby current: 25mA MAX 6. Frequency:2.402-2.480GHZ 7. Effection distance: 5M 8. Rf Output:4dBm Charger: Input: 12-24V Output:5V+/-0.25 Output current: 1000mA MAX Short circuit protection current: 2.4-3A