Top-mounted selection dial is for Vibration and Stimulation Levels (1-7) Green button operates Tone and any compatible accessories, like the Upland Beeper -Toggle switch selects which dog is being controlled (up to 3: black, red or blue) -Toggle switch FORECAST(‘M’ and ‘C’ selects stimulation type and ‘A’ is for Accessory Upper black button selects ‘medium’ level of stimulation (1-7), and turns Lights on. -Lower black button selects ‘low’ level of stimulation (1-7), and turns Lights off. -Pressing both black buttons at same time selects ‘high’ level of stimulation (1-7) Includes - PRO 550 handheld, AC adapter, manual