The Green Lion Ocean Open Ear Headphones offer a new and cozy listening experience through their innovative open-ear design, with the assurance of safety while remaining conscious of your environment. Constructed from tough ABS, PC, and TPE materials, the headphones are made for both comfort and quality. They come with a 16.2mm driver speaker and deliver balanced, clear sound with a frequency response of 20Hz-20kHz at an impedance level of 16?±15% and sensitivity of -85dB. The Bluetooth V5.3 connectivity allows for a 10m stable range. There is a 440mAh battery in the case and a 40mAh battery in the earbuds, so the headphones have up to 6 hours of playing time, 4 hours of talk time, and 180 hours of standby. The charging is easy with Type-C charging and only 1.5 hours. Other features are touch control, IPX4 waterproof, and 135° free rotation, so it is perfect for active life. Specification Material: ABS + PC + TPE Case Battery: 440mAh Earbuds Battery: 40mAh Bluetooth: V5.3 Transmission Range: 10m Speaker Driver: 16.2mm Frequency: 20Hz-20kHz Impedance: 16?±15% Sensitivity: -85dB Waterproof: IPX4 Charging Port: Type-C Charging Time: 1.5H Playtime: 6H Talk Time: 4H Standby Time: 180H Features Open-Ear Design Touch Control Type-C Charging 135° Free Rotation