The PRO 550 with proven Tri-Tronics technology allows advanced training for the serious professional with easy access to 21 levels of momentary and continuous stimulation, tone as well as the ability to quickly switch between 3 dogs. PRO 550 features vibration and tone settings, remotely operated beacon lights on the dog device to help locate your dog in low light, the ability to add an Upland Beeper (purchased separately), and a built-in BarkLimiter, activated on the dog device, to help keep the peace at home.
Specifications:

Type
Function	Dog Trainer
Channels
Range	1 Mile
Battery	Rechargeable Li-ion
Screen Type
Proofs
Backlight
Color	Black
Privacy Codes
Data Cards
Compatible With	Up to 3 Dogs