Specifications - Bluetooth Version: 5 - Chip: BK3266 - Profiles: HFP / HSP / A2DP / AVRCP - Operating Distance: 10 m - Frequency Response: 20 Hz – 20 kHz - Sensitivity: 97 dB - Driver: 10 mm - Impedance: 32 ? - Battery Capacity: 250 mAh - Charge Time: 2 Hours - Playback Time: 18 Hours - Power Requirement: 5V DC , 1A Features and Benefits: - Up to 18 Hours Playtime - SD Card & Aux Inputs - Hands-free Calling - Folding Design - Extra Soft, Padded Ear Cups What's in the box 1 x Headphones