15-25 hours of talk time, 350 hour standby time and a 3-hour charge time ensure this device is always ready for use. Compatible with Mobile phones, Pads, PCs, TVs, Laptops and more, 12 colors are available to suit your preference. Communication is over Bluetooth 5.0, with wireless range up to 15 meters and frequency at 2.4-2.48GHz. Impedance is rated up to 32Ω, with total harmonic distortion at 0.38%. With a built-in 400 mAh rechargeable battery, an 85dBdB sensitivity and 1238mW max output, these headphones are both powerful and efficient. Plus, the detachable cable, TF card compatibility (TF card not included) and genuine leather headphone pads make them comfortable to wear. All of this backed by CE, FCC, RoHS, and UL certifications.