This is a single main unit by BbTALKIN. You need at least two main units to communicate with another person. You will also need a head accessory to mount this main unit on.
You would purchase this item to replace a damaged main unit or if you want to add a person into your existing communication circle. For example, if you own x1 master unit and x2 main units for a three person communication system, and you now have the need to add a fourth person to communicate with the group, you would need to purchase another main unit.
x1: Main Unit
x1: Waterproof Case
x1 Marine Mount
x1 Double Sided Tape
x1 Goggle/Hat Mount
x1 Alcohol prep
MAIN UNIT SPECIFICATIONS:
Maximum distance: *open field 1mile (1600m)
Operating time: 15h
Stand by time: 700h
Charging time: 2h
Water proof level: IPX7
bluetooth Ver.: 3.0
Profiles: HSP, HFP, A2DP, AVRCP
Radio authentication: TELEC, CE, FCC
CH1=Intrcall, CH2=Phone, CH3=Music
From the date of purchase, all units come with a 1 year limited warranty.