The built-in 3.7V\/2000mAh battery takes 2.5 hours on a single charge and provides 14 hours of PTT time, 12 hours of music playback at maximum volume and 90 hours of standby time When the Bluetooth microphone is connected to your radio, simply press the PTT button on the microphone to talk to your partner Not only can it connect to your radio, but also to your iPhone\/Android phone or tablet. When the Bluetooth microphone is connected to your phone, you can use it as a small Bluetooth speaker to play music or answer calls The 2-pin microphone port is compatible with Motorola radios with a 2-pin headphone jack. Don't work for Kenwood, not for Pershing, not for Woolson, not for Baofeng, not for Midland Radio Specifications: Material: PVC Bluetooth version: 4.2 Bluetooth protocol: HFP\/HSP\/A2DP\/AVRCP\/SPP Transmission range: 10m Transmission power: CLASS2.4dbm Sensitivity: 80dBm\u0026lt;0.1% bit error rate Audio performance: SBC decoding Audio noise ratio: \u0026ge;75dB Speaker power: 1W\/8R(116dB) Headphone jack: 3.5mm (PPT headset is supported) Battery capacity: 2000mAh\/3.7V