Technical specification:
bluetooth specification: 4.2
bluetooth profile: avrcp/a2dp/hsp/hfp
transmission distance: 30-40 ft
battery: lithium-ion polymer 170 mah

immersive sound quality: tuned for enhanced bass response by swiss audio engineers. 40mm speakers offer precision hd sound with powerful bass.
Ultimate wearing comfort: the memory foam protein leather ear cushions feel like human skin texture, providing maximum comfort and isolation from external noise.
Dual-mode: thanks to the optional aux connector you can quickly switch between the freedom of wireless and the reliability of wire with the detachable 3.5mm audio cable. In wired mode, the headphones work without being charged. Important: the microphone only works in the wireless mode.
Perfect fit: the extensible headband allows you to simply adjust the headphone’s size to your individual preference
frequency response: 20hz -22khz
charging port: micro usb
charging time: 1-2 hours
playback time: up to 15 hours
standby time: 450h