Swissten Jumbo - incredibly comfrotable wireless Stereo headphones 16 hours operation time Pure Bass Foldable Call and music Input USB-C Closed Earmuffs Specifications: Version: Bluetooth V5.3 + EDR (ATS chipset) Frequency Range: 2.402 GHz - 2.480 GHz ISM Band Transmission: CLASS 2 Channels: 79 Channels of 1 Mhz BW Operation rande: 10 m Requency Responses: 20 Hz - 20 kHz Speaker sensitivity: 98 dB +/- 3dB Speaker diameter: 40 mm Speaker impedance: 32 Ω Signal to Noise rate: 80 dB Driver output: 2 x 30 mW Status Indicator: Red, Blue inticator Compatibility: Suitable for HFP, HSP, A2DP, AVRCP Battery: Li - polymerbattery 300 mAh Charging time: 2 hours Input: 5V DC 0.3 A Working time: max 16 hours Waterproof rating: IPX3