Product specifications: BT:4.1+EDR Support: L2CAP/A2DP(AVCTP/AVDTP/AVRCP), can receive AUDIO signal and control the AUDIO device. Support HSP/HFP (Handsfree profile), Built-in Mic for hands-free phone call Working distance: 10M SNR: >90db Battery: 1200MAH Built-in voltage:3.7V Normal volume time: 3H Speaker driver: 57mm*1 Power: 402/101 Frequency response: 60HZ-20KHZ IA Charging: 5V/500mA-2A Product Feature: 1. Advanced Wireless audio decoder chip, support all Wireless devices connected; 2. Support FM radio, you can search area stations directly; 3. Soft, clear and dynamic sound, all levels clear; 4. Reading TF card and USB card directly; 5. The wireless transmission range can be up to 10 meters;