· Bluetooth Version: V4.1 CSR8635 IPX4 waterproof · BT Profile:HSP V1.2 ,A2DP V1.2, AVRCP V1.4, HFP V1.6, DI V1.3 · Frequency range: 2.402G-2.480G · SNR: ≥80dB, Distortion: ≦ 1% · Wireless working distance: 10m-20M · Rated Power Input：10mm 2*2mW · Music time: ≥ 3.7V,60mAH,Maximum volume 3H, 80% volume 5H, 50% volume 10H · Standby time : ≥ 60Hours, Charge time: 1Hour · Supports voice call. Previous/next song, Last phone number redial, Caller phone number voice reporting function. Voice remind. Noise Cancelling. Bluetooth Mandatory entry pairing