Material: ABS Product features: Frequency Response Range: 20Hz-20KHz+ transmission time (25ms) Charging bin battery: 450mAh Receiver: TYPE-C/Lightning Product features: 1. Built-in charging compartment, easy storage, open the cap to turn on, automatic connection, not need pairing 2. Plug and play, no APP, one key to noise reduction, one key to mute; 3. 4G private protocol, stable transmission 4. AI intelligent noise reduction; supports recording while charging and doing live streaming 5. 360° HD sound, 30m barrier-free wireless connection 6. Ultra-low delay, sound and picture synchronization, suitable for a wide range of: live broadcast, recording, online courses, shop visits, interviews, etc. 7. Compatible with 99% of mobile phone models, ultra-long battery life, ultra-long standby