Noise Canceling Microphone: External 330 rotary microphone with noise reduction technology reduces environmental sound, enhances human voice, ideal for clear conversation. Ergonomic Design: Lightweight design, adjustable headband length, soft ear pad provide maximum wearing comfort, suitable for different head size wearing. BT5.0 Wireless Connection: BT 5.0 ensures low power consumption, stable connection, and fast transmission speed. Compatible with almost all BT-enabled audio devices. Long Battery Life: Built-in rechargeable lithium battery, 2 hours charging, can provide about 20 hours of working time, and about 200 hours of standby time. Specifications: BT Version: 5.0 Operation Range: 8-15 meters (no obstacle) Frequency Range: 20-20KHz Sensitivity: 1113dB Impedance: 32 Battery Capacity: 3.7V 250mAh Music Playing Time: about 20 hours Standby Time: about 200 hours Charging Time: about 2 hours Color: Black Item Size: approx. 18.0*15.3*4.7cm/7.08*6.02*1.85in Item Weight: 56g/1.97oz Charging Base Size: 8.7*5.5*2.8cm/3.42*2.16*1.10in Charging Base Weight: 95g/3.35oz Package Size: 20.2*17.5*6.0cm/7.95*6.89*2.36in Package Weight: 265g/9.34oz Package List: 1 * On-Ear Headset 1 * Charging Base 1 * Charging Cable 1 * User Manual (English)