iKross Black Mini Bluetooth Handsfree Headset for LG Xpression, Optimus Elite, M+, C, M, V, 2x, G2x, Viper, Lucid, Rumor Reflex, Rumor Touch, Cosmos Touch, Cosmos 2, Connect 4G, Spectrum, Nitro HD, Extravert, myTouch Q, Esteem, Enlighten, Optimus Slider, Marquee, Envoy, Thrill 4G, Optimus 3D, Phoenix, Thrive, Revolution, Vortex Answer / End / Reject call, Comes with On/Off button. Last number redial Voice dial activate (when supported by mobile phone), Mute/Volume Control, Call waiting, Transfer a call between mobile and headset, Includes AC power adapter Bluetooth V2.0+EDR, Operation Range: 10 meters (extended), Talk time: up to 4.5 hours Standby time: up to 70hrs, Charging time: 2.5 - 4 hours, Battery: Rechargeable polymer battery Size: 67mm x 26mm, Weight: 16g, BQB, FCC, CE and RoHs approved