NDBTMAX1021EB, Ninja Dragon BTMAX Waterproof Bluetooth 5.1 Wireless Earbuds. Powerful all new Ninja Dragons BTMAX Bluetooth 5.1 wireless earbuds. Equipped with latest bluetooth 5.1 technology with upgraded sound chip providing an ultimate 9D sound experience. Features : Model No : NDBTMAX1021EBUPC : 723503021203Brand : OnetifyCoutnry of Origin : USWith its 2200mah charging case, you can enjoy days of usage and also use the charging box as your mobile phone charger at anytime and anywhere.3 levels battery indicator on the charging box providing you with real time info of the battery level of each earbud and the charging box as well.50mah high capacity battery for each earbud giving you up to all day usage.With its 2200mah charging box capacity, it can provides you up to 180 hours usage time.A fully charge box will able to charge your earbuds up to 40 times.Bluetooth 5.1 with IPX7 waterproof. 6 core upgrades for this 2021 model.