M1 Product parameters: Features: Bone Conduction Headphones: Unlike traditional earbuds deliver audio through air into your ear canals, bone conduction headphones deliver audio through your cheekbones to inner ear. Less than 2 hours full charged can continuous play music 6-8 hours. Improved Ergonomic Structure, more fit and comfortable wearing and less sound leakage, better sound quality and more bass. Design for Sports with high intensity material, completely sweatproof, suitable for outdoor activities. latest Bluetooth-compatible V5.0 technology, Faster paring and more stable connection. Compatibility with TV and Android smart phone, etc.  Specifications: Material: ABS Color: Black, Blue, Pink, Red Size: (Approx) (LxWxH) 15*13*4.8cm/5.91*5.12*1.89in Bluetooth-compatible version: 5.0 Speaker type: bone conduction vibrator speaker Life time: about 7 hours Bluetooth-compatible distance: about 10 meters Charging time: about 2 hours Bluetooth-compatible protocol: A20P/AVRCP/HSP/HFP Powered by : Battery (Included) Battery capacity: 150 mAh  Package Included: 1pc x Bone Conduction Headphone 1pc x charging cable 1pc x external microphone 1pc x English manual  Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement    (No retail package)