Features: Multi-purpose Headphones: Fits for making office busin conference calls, call center phone calls, online courses, language learning, playing games, listening to music, etc. Noise Canceling Microphone: External 270° rotary microphone with noise reduction technology reduces environmental sound, enhances human voice, ideal for clear conversation. omic Design: Lightweight design, adjustable headband length, soft ear pad provide maximum wearing comfort, suitable for different head size wearing. BT5.3 Wirel Connection: BT 5.3 ensures low power consumption, stable connection, and fast transmission speed. Compatible with almost all BT-enabled o devices. Long Life: Built-in re able lithium , 2 hours charging, can provide about 15 hours of working time, and about 200 hours of standby time. Specifications: Drive Unit Diameter: 30mm BT Version: 5.3 Operating Range: 10 meters (no obstacle) Frequency Range: 20-20khz Sensitivity: 105 ± 3db Impedance: 32Ω ± 15% Battery Capacity: 3.7V 300mAh Music Playing Time: about 15 hours Talk Time: about 17 hours Standby Time: about 200 hours Charging time: about 2 hours Waterproof: IP65 Color: black Item size: Approx. 15.0*13.2*4.9cm/5.90*5.19*1.93in Unit weight: 51g/1.79oz Package size: 16.0*14.5*5.5cm/6.30*5.70*2.16in Package weight: 220g/7.76oz Package list: 1 * On-ear headset 1 * Charging dock 1 * Charging cable 1 * User manual