PU leather earmuffs are comfortable and breathable: The earmuffs are made of soft and skin-friendly materials, which are lightweight, comfortable and breathable, and can be worn for a long time without getting tired Up to 40 Hours Playtime: With an impressive battery life of up to 40 hours on a single charge, you can enjoy uninterrupted music throughout the day Advanced Bluetooth5.3 Connectivity: With Bluetooth 5.3 technology, these workout Headphones Bluetooth offer more stable transmission speed, lower latency and better audio output. The Headphones can give you wonderful music enjoyment Premium Audio Performance: Equipped with high fidelity 40mm dynamic coil unit, these headphones deliver crystal-clear highs, balanced mids, and powerful bass Button operation, convenient design: Simple button operation design, can be easily controlled Specification: Bluetooth version: V5.3 Bluetooth data stream: HSP, HFP, AVRCP, A2DP, SBC, AAC New chip: JELI AC7006F Charging time: about 2 hours Music playback time: about 40 hours of long battery life (depending on the volume of the song) Talk time: approximately 40+hours (depending on volume) Sound quality: Dual differential circuit design, high fidelity heavy bass Effective and stable connection distance: about 30 meters Supports 3.5mm audio input jack Support external TF memory card playback Support low latency game mode Durable, rotatable, metal telescopic pull tab structure Battery specification: 3.7V/400mAh with overcharge and over-discharge protection Input voltage/current: 5V/1A Speaker: diameter 40MM, 32 Output power: 22MW Microphone: Sensitivity -42dB 2 Charging port: Type-C Package included: 1 x Headphone 1 x Audio Cable 1 x Charging Cable 1 x English User Manual