These couple 5.2 bluetooth chip newly upgraded earphones are the perfect addition to your everyday carry. Fast and stable connection thanks to advanced Bluetooth 5.1 technology, while CVC 8.0 noise cancellation technology provides clear sound quality. You'll appreciate great Hi-Fi stereo sound, and a built-in microphone for taking calls or redialing your last call. IPX7 waterproof construction means you can wear them for any activity, even when you get sweaty. With up to 180 hours of playtime on a single charge, these headphones keep you going all day. Features: Bluetooth Version: V5.1 Earbuds Battery Capacity: 50mAh Working Time: 3-5H Working Range: 10M Talk Time: 180H Standby Time: 280H Operation Mode: Touch Waterproof Level: IPX7 Product Color: Black Certification: CE Battery Voltage: 3.7 V Input Voltage: 5V Transmission Distance: ≥10MS Speaker: 20 -20khz Noise Reduction Version: CVC8.0 Automatic Power On: Support Automatic Pairing: Support Control Mode: Smart Touch Up to 220 hours at a time Charging compartment Input current: 5V 1A Magnetic function: Magnetic nano charging Charging box Battery capacity: 3000mAh (can be used as a power bank)