Title:TWS Neckband Earphone S1 Wireless In Ear Sports Headset Arbitrary Bending 3D Surround Magnetic Absorption Storage Waterproof EarphoneFeatures:[Boot and connect,memory link function] It can be used after power on,with built-in BT 5.1 chip.Quickly search for information and memorize.[Wide compatibility] Mobile phones,tablets,computers all can be used.[Living waterproof,no fear of swaet corrosion] Sports sweat or water splash,can maintain stable playback.[Built in memory steel wire,soft and comfortable to wear] The neck hook is comfortable,flexible and elastic.[Magnetic suction design,convenient storage] Close to automatic adsorption,do not worry about storage winding.Specification:Scheme: Bluetrum 5616Model: S1Battery: dual battery 85 mAh,170 mAh in totalMaterial: ABS+metal+silica gelService time: 15-20 hoursStandby time: 200 hoursService distance10MProduct size: 11.5mm*20.5mmProduct weight: 50gColor:Green,Gules (Optional)Package list:1*Wireless Headphones1*USB Charging Cable1*User Manual