The built-in 3.7V/2000mAh battery charges fully in 2.5 hours and provides up to 14 hours of PTT usage, 12 hours of continuous music playback at maximum volume, and up to 90 hours of standby time. When the Bluetooth microphone is paired with your radio, simply press the PTT button on the microphone to communicate. It can also connect to your iPhone, Android phone, or tablet. When connected to a mobile device, it functions as a compact Bluetooth speaker for music playback or hands-free calling. The 2-pin microphone port is compatible with Motorola radios that have a 2-pin headphone jack. It is not compatible with Kenwood, Icom, Vertex Standard, Baofeng, or Midland radios. Specifications: Material: PVC Bluetooth version: 4.2 Bluetooth profiles: HFP, HSP, A2DP, AVRCP, SPP Transmission range: Up to 10 meters Transmission power: Class 2, 4 dBm Receiver sensitivity: -80 dBm at less than 0.1% bit error rate Audio decoding: SBC Signal-to-noise ratio: ≥75 dB Speaker output: 1W/8Ω (116dB) Headphone jack: 3.5mm (supports PTT headsets) Battery capacity: 2000mAh/3.7V