... funciton, long distance wireless signal receiving 2.It can match with 40 pagers and 1 remote controller to work at most 3 ... .High brightness LED light display,with voice prompt, ding dong or music are optional, 12 polyphonic ... ,can be mixed to use 5.Receiver can external connect with flashing light6.Dimension:286x130x28mm more information ,feel free to contact ...