Features: 1. Utilizes the latest CSR 4.0+EDR Bluetooth technology for strong signal transmission and ultra-low power consumption, compatible with most Bluetooth devices. 2. Supports automatic answer function with option to switch to manual answering; includes a built-in high-quality anti-interference microphone for effective hands-free calling, answering, and hanging up. 3. High sound fidelity with controls for next/previous track, volume adjustment, play/pause, and automatic redial; simple and intuitive operation. Specification: Connection Name: BT Bluetooth Version: V4.2+CSR (updated version, may differ slightly from manual) Transmission Distance: 10M (varies due to environmental factors and mobile device compatibility) Bluetooth Pairing Distance: 20-30 meters (depending on the device) Standby Time: 120 hours Play Time: 15 hours Charging Time: Not specified