1; Mode switching (Build-in automatic or Programable)

First open the body receiver, and switch to single shooting mode, pull and hold the trigger for 5 seconds until the motor beep, then release the trigger for another motor beep, mode switchimg completed.

2; Program for quantity of rounds burst mode (within 30 rounds)

First open the body receiver, and switch to automatic mode, pull and hold the trigger for 5 seconds until the motor beep to enter the program mode: You have to pull and hold the trigger to fire for the quantity of rounds brust (for example, if you want 13 rounds brust, pull and hold the trigger until 13 rounds fired), then release the trigger after this long hold, to finish, pull and hold the trigger for 5 seconds until the motor beep, program completed.