WORK4 PRO Bulkpack With Extended Boom Mic communication system comes with a longer length microphone to better accommodate installation into arborist helmets. An extra mic is included so when it needs to be replaced, it is already available to install. Improve safety and efficiency through the SENA WORK4 communications device, a Bluetooth 3.0 stereo headset with long-range Bluetooth intercom communications. This device has changed the way the industry communicates. System features include:**HELMET AND MUFFS SOLD SEPARATELY** Bluetooth 3.0, Bluetooth intercom up to 900 meters (980 yards), Four-way conference intercom capability, Conference phone call with intercom participant, Universal Intercom, Music sharing,Bluetooth pairing for dual mobile phones, Voice prompts, Bluetooth stereo headset for Bluetooth audio devices such as MP3 players, Bluetooth music playback control by AVRCP: play, pause, track forward and track back. Easy operation by versatile Jog Dial, Sufficient sound level with integrated audio booster, Bluetooth handsfree for Bluetooth mobile phone, Speed dialing, Sidetone, Stereo music by 3.5mm audio cable, Water resistant for use in inclement weather, Crystal clear and natural sound quality, Advanced Noise Control, Up to 12 hours talk time, 10 days stand-by time, Two-year warranty, Individual volume control for each audio source.