... ,answer,hang cellphone Motorcycle bluetooth helmet interphone headset with 500M Features: 1. Wireless headset for bluetooth enable cell phone at ... , backward, play, pause9. Automatic switching among bluetooth cell phone, intercom, stereo music, FM radio.10.With DSP echo cancellation ... 0.3 KGCarton Box : 40x26x21 cm (10 sets , G.W.: 3.0 KG) Motorcycle bluetooth helmet interphone headset with 500M