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Specification: Version: V4.0 EDR Function: bluetooth / handsfree /wireless Frequency Range: 2.402GHZ~2.480GHZ ISM Band Standby Time: 160 Hours Rechargeable Battery: 3.7V 100 mAh Receiving sensitivity: Note:1.In order to extend life span of the product, please don\'t charge more than 3 hours.2.Please do not use when charging. Package Included:1* Bluetooth Headset1* USB Cable (Retail package is not included,We use safe express packing)