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TWS Mini L21 Pro Headphones Wireless Sports Earbuds Waterproof Stereo Surround Sound Works On All Smartphones Bluetooth Earphone Color:L21 LED White so chlorine gas is aDear customer, welcome, and wish you a happy shopping~ L21 Pro Bluetooth version: V5. 0+EDR Working distance: 10m Life time: About 4 hours Standby time: About 12 hours Charging time: About 1 hours Battery capacity: 350mAh Color: Black White Pink Features: 9D cinematic holographic sound Double noise reduction No fear of interference Multi function buttons upgrade smart operation packing list: L21 Bluetooth headset*2 (L21 light display and L21 Pro