Gearonic AV10249-Beige-Ear Mini Wireless Bluetooth 4.0 Stereo in-Ear Headset Earphone Earbud Earpiece - Beige Bluetooth Version: V4.0+Edr Wireless frequency: 2.402-2.480GHz Talk time: about 4 hours Music playing time: about 3 hours Standby time: about 120 hours