Features: 1. Loudspeaker keep close to the ear but it is not into the ear, no ear plugs to clogged eardrum, will not feel painless in the ear canal. 2. Ear hook earpiece is very light and smart, painless even wearing long time.If you wear glasses, it suitable for small or thin glasses frame. 3. Compatible With Bluetooth Bone conduction headphones with open ear design to protect hearing, suitable for people with mild hearing impairment and outdoor workout such as running, hiking, bicycling, etc. 4. High-resolution stereo subwoofer gives you a live music experience. 5. No earplugs design, easy to understand the surrounding environment, safer to use. Notice: *Actual color may be slightly different from the image due to different monitor and light effect *Please allow 1-3cm deviation due to manual measurement Description: Product weight: 16g Package size: 16.7*13*4.9cm Battery capacity: 150mAh Bluetooth range: 10m Charging time: 2h