Description: Bluetooth version V4.0 + EDR for most Bluetooth-enabled devices. Elastic woven material, warm, soft and elegant design. You can fix your hair and let you listen to music and talk while doing various other activities. Built-in microphone, can be used to directly transfer the call to your audio device, hands-free listening. Built-in rechargeable lithium-ion battery, charging through the USB cable, waiting for a long time. When you exercise, you can absorb sweat. When you sleep, you can use your eyes. You can undo and wash. specification: Bluetooth version: V4.0 + EDR Frequency: 2.0Hz-20 kHz Transmission distance: 10 M Lithium-ion battery: 180 mAh Charging time: 2 H Continuous talk time: 4-6 H Music playback time Bluetooth: 3-6 hours Standby time: 21 Hour sensitivity: 95DB Impedance: 32 ohms Speaker size: 32 mm The speaker is detachable so you can clean the hat packing list 1 x Bluetooth music scarf 1 x charging cable 1 x manual