Bestpriceam Wireless Stereo Bluetooth 4.0 Earphone Headphone Headset Voice Prompts (Black) Voice prompts, voice reporting, voice answer Built in Microphone for Handsfree Cell Phone use Talk time: about 4 hours, Music time: About 5 hours, Support Format: MP3 WMA WAV Control Buttons: Play/Pause/ Call / Receive ,Previous/Next, VOL +, VOL -, Mini-USB INc Compatible for all the mobile devices enabled Bluetooth V4.0