Yasalu S530 Mini Ultra-small Bluetooth 4.0 Stereo Headset Earphone Earbud (Black) Transmission range: 10 m. Small and light, stealth design. Taiwan and the bluetooth master control chip. Can talk, listening to music. 4 hours talk time(music playback three hours / standby time 120 hours / working current &lt;15mA). Multi-point connections can be connected to two one with two Bluetooth devices simultaneously. Built-in DSP audio processing system, can be a very good eliminate Noise and echo, to ensure clear communication, and music.