Bluetooth® Ver. 4.2› Output: Bluetooth Standard Protocol Power Class 2› Transmission distance: Up to 10 m (32 ft.)› Frequency used: 2.4 GHz (2.4000 GHz–2.4835 GHz)› Modulation: FHSS› Supported Bluetooth profi les: A2DP/AVRCP/HFP/HSP› Supported codecs: SBC› Multi pairing: Max. 8 devices› Power source: DC 3.7 V rechargeable lithium-ion battery› Battery time: Max. 6 hours with continuous connection(including audio playback)› Charging time: Approx. 1.5 hours› Type: Fully enclosed dynamic headphones› Driver: φ 8 mm (5/16˝) dynamic driver› Frequency response: 10 Hz–20 kHz› Weight: 13 g (0.46 oz.) including battery pack› Supplied with S/M/L silicon earphone tips and micro USB cable #!