Can store 4 sets of speed dial numbers, end customers can store/delete by SMS editing.

After dialing, numbers 1, 2, 3, and 4 will be automatically dialed in a loop. If number 1 is answered, numbers 2, 3, and 4 will stop being dialed. If number 1 is not answered, it will automatically switch to numbers 2, 3, and 4 until answered.

Direct conversation available on-site after connection.

Incoming calls can be automatically answered, allowing listening to on-site sounds.

The device will automatically hang up after the caller hangs up, freeing up the line.