Features: 1. Utilizes advanced 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. Built-in high-quality noise-reducing microphone enables convenient 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 Transmission Distance: 10M (may vary due to environmental conditions and device compatibility) Bluetooth Pairing Distance: 20-30 meters (varies by device) Standby Time: 120 hours Play Time: 15 hours Charging Time: Not specified