Overview: Bluetooth headphones, touch technology with built in incognito microphone featuring a rechargeable lithium ion battery. Product features: Touch Control Technology, Built-in Incognito Microphone, Portable Foldable Design, Rechargeable Lithium Ion Battery, EVA Carrying Case, Compatible With Most Bluetooth Enabled Smartphones Specifications: Bluetooth version Bluetooth 3.0 + EDR; Bluetooth profiles: A2DP, AVRCP, HSP, HFP; Range: Up to 10m/33ft; Battery: 3.7 V, 350 mAh; Charging: About 2 hours; Play / Talk time: Up to 9 hours / 10 hours; Sound pressure level: 118 dB; Impendence 32 + 32 ohms; Frequency response 20~20k Hz; Rating power:200 mW; Max input power: 1000 mW; Length of cable: 12m; Plug: 3.5 mm