Why dose my receiver emit “Di-Di-Di...” all the time?

First, the receiver may be in low power. Please charge it for about 1-2 hours.

Second, in Wireless Dog Fence Mode, when the transmitter turns off, the receiver will sounds“Di-Di-Di...”.You can turn on the transmitter and press “Mbutton to switch to Remote Dog Training Mode, then turn off the transmitter.(When the receiver can not receive signal, it will sound “Di-Di-Di...") Third, in Wireless Dog Fence Mode, the receiver is out of the preset range.When you are back to the range, the sound will stop.