Mezzo Wireless On-Ear Headphones have a True Wireless Stereo connection, Auto-Pairing /Auto Power-On, multi-function buttons & dual microphones for hands free operation. Press the Vol+/Next Track button to activate Siri (iOS devices) or Google Assistant (Android devices), works as single or pair; with power level indicator lights. Playtime: 4 hours on single charge & up to 13 hours with charging case. Charging time: 1-1/2 hours for earbuds & case. Includes micro USB cable and is FCC certified.