Manhattan 178167 Wireless Heaphones, Black Hands-free Profiles: A2DP, AVRCP, HS/HF Battery: Internal rechargeable lithium polymer Frequency Response: 20 - 20 kHz Impedance: 32 ohms On-ear design with soft, padded ear cushions for maximum comfort Delivers high-quality wireless streaming from Bluetooth-enabled devices from up to 30' away Built-in, recessed microphone Lithium polymer battery provides up to 10 hours of playback time (250 hours of standby time) Micro-USB charging cable included Integrated on-ear controls allow you to easily adjust volume, play/skip tracks and answer calls