SWISSTEN JUMBO headphones have excellent sound, fit perfectly on the ears and last up to 16h. Thanks to the microphone, you can even make phone calls with them. ConvenienceThese headphones are designed for high user comfort and their ergonomic shape adapts perfectly to your ear. Sound qualityThe ergonomic shape of the headphones shields the ambient environmental noise, giving you the perfect amount of clear, high quality sound to enjoy plenty of your favourite music. Call or listening timeListen to music or make a phone call with SWISSTEN JUMBO headphones for a long 16 hours. Practical designThe SWISSTEN JUMBO wireless bluetooth headphones have a foldable design so they won't take up much space in your bag or backpack. Compatibility SWISSTEN JUMBO works great with IOS and Android devices. Version: Bluetooth V5.3 + EDR (ATS chipset) Frequency Range: 2.402 GHz - 2.480 GHz ISM Band Transmission: CLASS 2 Channels: 79 Channels of 1Mhz BW Operation range: 10m Frequencu responses: 20 Hz - 20 kHz Speaker sensitivity: 98 dB +/- 3 dB Speaker diameter: 40 mm Speaker impedance: 32Ω Signal to Noise rate: 80 dB Driver Output: 2 x 30 mW Status Indicator: Red. Blue indicator Compatibility: Sutitable for HFP, HSP, A2DP, AVRCP Battery: Li-polymer battery 300 mAh Charging time: 2 hours Input: 5 V DC 0.3 A Working time: max 16 hours Waterproof rating: IPX3