Feature: 1. EXQUISITE DESIGN: Convenient to carry, delivering excellent performance for calls and music on smartphones with outstanding sound quality. 2. SMART BT TECHNOLOGY: BT connection is stable and reliable, providing premium stereo sound, immersing you in the world of music. 3. BUILT IN MICROPHONE: You can make clear and distortion free calls anytime, anywhere to keep communication smoothly with this headset. 4. SOFT EARPAD DESIGN: Comfortable wearing, reducing discomfort from long term headphone use. Enjoy the music time. 5. MULTIFUNCTION BUTTONS: Earphone features multi buttons design that is convenient for music playback, answering and hanging up calls, enhancing user convenience. Specification: Item Type: BT Headset Material: Rubber Headphones: Rechargeable 400mah Lithium Battery(Built In) Memory Card: Support(Without) Collapsible BT Version: 5.0 Support BT Mode: A2dp 1.2, Avrcp 1.0, Hsp, Hsf 1.5 Frequency: 2.402 to 2.480ghz, 2.4g Ism Band Rf Performance: Receiving Sensitivity -84dbm; Transmit Power ≤4dbm Frequency Response: 20 Hz to 20 Khz Signal To Noise Ratio(Snr): 95db; Total Harmonic Distortion Rate (Thd): 0.1% Normal Charging Time: About 3 Hours Operating Temperature: -20℃ to 55 ℃ . Package List: 1 x Earphone 1 x USB Date Cable 1 x English Manual