The rugged, versatile SportHunter Series excels in all environments and is especially suited to upland and multi-dog hunting situations. With blaze orange collar straps and high-visibility yellow accents on the transmitters, they can be seen from a distance and readily located if dropped in the field. The 800 can be expanded to control up to 3 dogs by adding SportDOG Brand Add-A-Dog™ collars. With a long 1/2 mile of range and the comfortable 'Soft Coat' Transmitter finish, this unit is a pleasure to handle. Dog Training Gear the way you'd design it.