[DSP Noise Reduction] DSP noise reduction filters outside noise to improve speech clarity. Built-in Mic grasps the detail of voice, ideal for in-car calling or working use. [Super Long Standby Time] 220mAh rechargeable battery lasts about 48 hours of talking time or 36 hours of music playing time and 365 hours of standby time on one full charge. [Comfortable to Wear] The earbud head is 180° rotatable, suitable for left and right ears wearing. [Easy Operation] Simple operation, easily controls playing/pausing, previousext songs, answering/rejecting/ending an incoming-call. Note: Press the multi-function button 4 times to change the language of the voice prompt. Specifications: Model Number: X18 BT Version: 5.1 Support Protocol: Headset, HFP, A2DP, AVRCP Operation Range: Up to 10 meters (no obstacle) Headset Battery: 220mAh rechargeable Lithium battery Music Playing Time: about 36 hours (depends on music volume) Talking Time: about 48 hours Standby Time: about 365 hours Charging Time: 2-3 hours Charge Port: Micro USB Charging Voltage: DC 5V Color: Black Main Item Size: 7.55.01.2cm/2.951.960.47in Main Item Weight: 14.4g/0.50oz Package Size: 12.08.02.3cm/4.723.150.90in Package Weight: 43.2g/1.52oz Package List: 1 * BT Headset 1 * USB Cable 1 * Earcap 1 * User Manual (EN/CN)