Technical specifications * True wireless * Impedance (microphone) 2.2 kOhm * Impedance (headphones) 32 Ohm * Connection type Wireless Bluetooth * Type of earcups Closed * Battery capacity 250 mA·h * Bluetooth specification V5.0 + EDR, A2DP, AVRCP, HFP, HSP * Operating frequency 2.402?2.480 GHz * Membrane diameter 10 mm * Sensitivity (headphones) 102 dB * Sensitivity (microphone) -42 dB * Frequency response (headphones) 20?20000 Hz * Frequency response (microphone) 100?16000 Hz * Operation range 0?10 m * Continuous talk / listening period 4 hrs * Material of headphones Plastic * Color White * ROHS / CE Yes