Features: 1. Bone Conduction Technology: Works by vibrations, sound transmit via cheekbone to your cochleas, which avoids hearing impairment compare to ordinary earphones. Open-ear design helps you stay alert to your surroundings, avoid danger and meanwhile enjoy music. 2. Design for Sports: IP56 waterproof to resist light rain and sweat for outdoor activities, such as jogging, cycling, running, driving etc. 3. Use ABS + titanium alloy enable the headphone lightweight but more durable. Ergonomic design for comfortable wearing make sure you do sport freely never worry about falling out. 4. Charging Time and Battery Life: Each side of earphone has built in 120m - Ah lithium battery. Full charge take 1.5 hours, Standby time 15 days and play time around 4 hours. With bluetooth v5.0 connectivity and convenient multipoint pairing compatible with your i - OS and Android bluetooth-ready smartphones or tablets and Mac and PC computers and laptops. Indicator status: Red light flashes quickly: low battery warning Steady red light: charging Blue light is always on: fully charged Blue and red alternately flash: BT match Blu-ray double slow flash: no match, maybe the device is powered off, or the distance between the two is more than 20m. The blue light flashes slowly: match/dial/play audio. Specifications: General Specification Model BH128 Wearing Type Hanging ear Net Weight (g) 36g Technical Parameters Microphone Yes bluetooth Version V5.0/ QCC3003 Transmission Distance 20m Receive Sensitivity 84d - B Impedance 10Ω Frequency Response 20-20k - Hz Battery Capacity 140m - Ah, 3.7V Charging Time (h) 1.5h Working Time (h) 4h Standby Time (h) 360h Package Included: 1* [bluetooth 5.0] BH128 Wireless bluetooth Earphone 1* USB Charging Cable 1* Manual