USB Bluetooth 5.4 wireless earphones with long battery life and voice assistant function. - Bluetooth version: 5.4 - Charging case capacity: 500mAh - Music playback time: 10 hours - Talk time: 12 hours - Usage time: 100 hours - Standby time: 400 hours - Access to voice assistant: Siri, Google Assistant - Mute button: Yes Thank you for viewing. Bluetooth 5.4 Earphone Microphone Earphone Single Ear Wireless Earhook Type CVC8.0 Noise Canceling Hands-free Blue 【Ultra-Long Battery Life】 【Equipped with a microphone for hands-free calls and a mute function】The Bluetooth headset is equipped with a single-directional microphone and CVC8.0 noise canceling function, 【Ergonomic design, compatible with both left and right ears】 【Bluetooth 5.4 connection stability, automatic pairing, CVC 8.0】 【Easy to use, strong compatibility】 *This is an item for sale as I no longer need it, and it is new and unused, so I have not checked its operation. I will handle initial defects, but please contact the manufacturer directly for any subsequent issues.