The Hail Storm Bluetooth earbuds feature flat tangle-free wires and allow you to answer calls and enjoy your music wirelessly up to 30 feet away and are compatible with most Bluetooth-enabled smartphones, tablets, laptops and desktop computers. These earbuds allow you to pause and skip tracks, raise and lower volume wirelessly and come in a clear case with a carabiner for safe transport. Battery: lithium 50 mAh. Music playing time: 2 1/2 hours. Talk time: 1 1/2 hours. Charging time: 1 1/2 hours. Standby time: 120 hours. Bluetooth version 4.2. Bluetooth profiles: HSP, HFP, ADP AND AVRCP. BQB-QDL, CE, FCC, MSDS, UN38.3 and RoHs.