Specifications: Wearing method: semi-in-ear Bluetooth audio decoding: AAC/SBC Support protocol: HSP, HFP, A2DP, AVRCP Speaker sensitivity: 115 d - B Microphone sensitivity: -42d - B Frequency response range: 50HZ~10KHZ Headphone battery capacity: 30m - Ah Charging compartment battery capacity: 400m - Ah Music duration: 3.5H Talk time: 3.5H Headphone standby time: about 120H (connected state) Input: DC 5V/1A Charging input port: Type C The number of times that the dual earphones can be charged: about 4 times Headphone charging time: about 1H Charging time of charging compartment: about 1.5H Charging box size: 55.3*46.5*22.5mm Headphone size: 35.2*16.4*18.3mm Packing size: 98*164*30mm Product material: ABS Product net weight: 44g Packing list:1. Packing box 2. Earphone 3. Charging case 4. User manual 5. Charging cable Features: Bluetooth 5.0 low power consumption, fast transmission, stable connection; Exclusive ID design, no sense of lightness, comfortable and semi-in-ear wearing; 3.13mm loudspeaker unit, SBC high-fidelity audio decoding, enjoy HIFI sound; Infrared in-ear detection IC, put on and play, take off and pause, intelligently listen to songs; 5.15H long-lasting battery life, worry-free travel, always accompanied by music; Regardless of primary and secondary earphones, single and dual ear mode switching without jamming; DSP noise reduction call, filter external noise, high-definition call is like face-to-face; QI standard wireless, direct charge dual choice; IPX5 waterproof life, wanton sports. ul>