Features: Brand new new and high quality Bluetooth 5.0 the latest Bluetooth V5.0 chip high-fidelity stereo the effect is shocking the call is clear and stable. Can be removed for cleaning. Ultra low power consumption continuous playback of music for 13 hours (for Apple 7 mobile phone maximum volume test). The transmission rate is fast and stable and the unblocked transmission distance is more than 20 meters up to 50 meters. English voice prompts for power on power off pairing success low battery maximum volume etc. The iOS system can display power and activate the SIRI Smart Voice Assistant. Side zipper design can be equipped with hot/cold dual-use ice packs. Description: Bluetooth specification:V5.0+EDR/A2DP/AVRCP/HFP Frequency range:2.4026GHz-2.480GHz Transmission distance:20 meters or more Channel:Stereo Speaker parameters:32 ohms / 30mm Speaker power:10 mW*2 Signal to noise ratio:104dB Microphone intercom Play time:13 hours (for apple mobile phone volume test) Talk time:14 hours or more Standby time:350 hours or more Charging time: 2 hours or so Packaged size:18*8.5*3cm Package included: 1*Bluetooth headset 1*Sleep scarf 1*USB charging cable 1*Instruction manual Note: Due to the difference between different monitors the picture may not reflect the actual color of the item. Thank you!