Feature:The rebound portable design can be rolled and folded automatically when not in use, and the diameter is only about 8cm, which can be easily stored in a small bag or clothes pocket. Product Name: Headset Model: M-1S Bluetooth-compatible version: V5.3+EDR Horn type: bone conduction vibrator Frequency: 20Hz-20KHz Impedance is 32 ohms Sensitivity 85dB/mW Waterproof grade IPX 5 Playing time: about 7 hours Battery capacity: 150MAH Standby time: 150 hours Charging time: 90 minutes Frequency band: 2.4GHZ Bluetooth-compatible protocol: A2DP1.3 AVRCP1.5 HFP Bare metal weight: 23G Complete set weight: 54.6G Packaged size: 9.5 x 9.5 x 2.5CM Packing list: Headset x 1 Charging Cable x 1 Instruction x 1 Carton Packaging x 1 Note: 1. Due to manual measurement, please allow 1-3cm error. Make sure you don&#39;t mind before bidding. 2. Due to the difference of different monitors, the picture may not reflect the actual color of the product. Thanks. <div class="panel panel-info"><div class="panel-heading" style="font-weight:bold;">IMPORT: THIS ITEM IS SHIPPED FROM CHINA. PLEASE EXPECT UP TO 25 DAYS FOR DELIVERY</div></div>

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