Product information: Introduction: The ergonomic design fits your ears and is comfortable to wear. Bluetooth 5.0 technology, faster and more stable transmission without delay. The left and right earphones can be used individually, and each can be connected to a smartphone. Noise reduction technology is used to intelligently filter out noise in the surrounding environment. Even in public places, the sound can be clear. Product name: Bluetooth wireless headset Transmission distance: 7m-10m Headphone charging time: 1h Talking/listening time: 3h Battery voltage: 32-4.2v Standby time: 120h Product name: wireless headset Headphone material: ABS Packing material: abs Waterproof rating: IPX4 Speaker impedance: 88mm, 16 Speaker frequency response: 20hz-20khz Speaker rated power: 3mw Speaker sensitivity: 98dB at 1dB Talk time (average volume): about 3 hours Music time (medium volume): about 3.2 hours Standby time: about 120 hours Bluetooth chip: used for Bluetrum Bluetooth version: 5.0 + EDR Transmission distance: 7-10 meters Power consumption: 13ma-15mA Input power: 93mw Headphone charging time: about 1 hour Battery capacity: single earphone 50ma, charging box 350mah (included) Charging cycle time: 2 Charging the charging box: about 1.2 hours Battery voltage: 3.2v- 4.2V Battery power: 0.203WH Function: wireless, Bluetooth 5.0, noise reduction, high-definition call, digital display Single headphone size: 17 mm X 22 mm / 0.67 inches x 0.87 inches (approximately) Note: Due to the different lighting and screen settings, the color of this item may be slightly different from the picture. Due to different manual measurement methods, please allow slightly different sizes. Thank you for understanding. Packing list: Bluetooth headset X1 Manual X1