Features: 1. Utilizes the latest CSR4.0+EDR Bluetooth technology, super strong signal transmission, ultra-low power consumption, and expenditure of all Bluetooth devices; 2. support for automatic answer function, can switch to manually answer the phone function, safe and fast, built-in high-quality anti-interference microphone, can effectively realize the hands-free answer, hang up the phone; 3. high sound fidelity, the function can be operated up and down song, volume up and down, play pause, automatic callback, and other functions, simple operation. Specification: Connection Name: BT Bluetooth Version: V4.2+CSR (update, slightly different from the manual) Transmission Distance: 10M (transmission distance varies due to environmental factors and mobile phone Bluetooth devices) Bluetooth Pairing Distance: 20-30 Meters (depending on the device) Standby: 120 hours Play Time: 15 hours Charging Time: