To begin, simply pair your Dogtra handheld transmitter with the SOUNDBOX2. Once paired, the SOUND BOX2 will make a beeping sound when the stimulation is applied and held down, becoming louder/quieter as the stimulation level goes up/down. The SOUNDBOX2 efficiently teaches students the level and duration of stimulation needed in different scenarios that the dog may come across. This compact and valuable training tool will be a great addition to your training session. Compatible with the iQ PLUS, 200C/202C, 280C/282C, ARC, ARC HANDSFREE, ARC WETLANDS, 1900S/1902S, 1900S HANDSFREE, 1900S WETLANDS, 1900S BLACK EDITION, EDGE, and EDGE RT. Simple to pair with your transmitter Teaches more effective training Auxiliary port for external audio 3 color LED indicator light Increased beep sound with higher stimulation levels