Headphone Features Bluetooth Version: V5.0 Dual Mode Distance: 15-20 meters Battery: Rechargeable Lithium Battery 55mAh Full Charge Time: 1.5 Hours Play Time: About 3.5-5 Hours*4 Earbuds Charging Current: 50mA Microphone Sensitivity: -382dB Frequency range: 20~2000Hz Headphone weight: 7.5g Waterproof: IPX7 Color: Black\/Green\/Pink Charging Case: Battery: Rechargeable Lithium Battery 650mAh (provides 3-4 times power) Full Charge Time: 2 Hours Input: 5V 500mA Output: 5V 100mA Dimensions: 58*10*13mm Weight : 55 gBluetooth 5.0 full wireless technology, high fidelity sound Equipped with the most modern Bluetooth 5.0, the transmission speed is twice that of the 4.2 version. Experience simple, fast and uninterrupted transfers. Install CVC 8.0 to reduce internal and external noise. Completely wireless with built-in microphone. It also supports voice + and - large capacity battery and IPX7 fully waterproof Comes with a 650mAh battery case, you can charge it multiple times. Enjoy music in the park on weekends and wherever you want to go.Thanks to IPX7 water resistance, your earphones are protected from sweat, water and rain, etc. Play music during your workout. NOTE: The case is not waterproof. Lightweight and comfortable Adapt to the cochlear design and appearance, and provide three adjustable sizes (S, M, L) of silicone earplugs to solve the problems of traditional earphones that are painful to wear and easy to fall off. Very light weight, only 7.5 grams per earbud, so your ears will never hurt. Two models of use: ear-hook or in-ear sports Bluetooth earphones, you don't have to worry about falling or losing when running.