Features 1.Long Battery Life: Bluetooth sports earphones have a built in 200 mAh battery and an upgrade chip. When fully charged, you can play the earphones continuously for up to 15 hours (50 percent volume). 2.HD Microphone: Wireless sports earphones have a built in HD microphone and CVC6.0 noise reduction technology to reduce outside noise. You can enjoy great sound quality with excellent bass and crystal clear highs. 3.Bluetooth 5.1 Chip: Bluetooth sports earphones use the latest Bluetooth 5.1 chip. Stable data transmission and wide wireless coverage. Compatible with all Bluetooth enabled devices. 4.IPX7 Waterproof: Wireless sports earbuds have IPX7 waterproof rating with built in nano coating to prevent sweat and rain. You are free to enjoy jogging, biking, driving, hiking, working out and other urban sports. 5.Ergonomic Design: Wireless sports earphones have an ergonomic neck design that distributes the weight of the earbuds evenly around the neck. 27.5 degree angled design prevents the earbuds from falling off. specificationItem Type: Bluetooth Neckband Headphones Material: ABS Color: Black Chip Solution: For Jerry AB5616B Battery Type: Built In 200mAh Lithium Battery (Included) Bluetooth Version: 5.1 Connection Distance: About 10m/32.8ft Playback Time: About 15 Hours Talk Time: About 15 Hours Charging Time: About 1.5 Hours PackageList 1 xBluetoothNeckbandHeadphones 1 x Charging Cable 4 x Earplugs