These bluetooth earbuds feature flat tangle-free wires that allow you to answer calls and enjoy music wirelessly. They work up to 30 ft away and are compatible with most Bluetooth-enabled smartphones, tablets, laptops, and desktop comuters. These earbuds allow you to pause and skip tracks, raise and lower volume wirelessly, and come in a convenient clear case with a carabiner. 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.