The compact, handheld transceiver delivers GPS tracking capabilities, including multiple waypoint creation, with no external antennas required. Track up to 12 dogs' locations out to seven miles on the backlit LCD featuring a 1-1/2"W x 1-7/8"H screen with autoscaling from 100yds. to 75 miles. Not only does the unit show where your dogs are, it also reports whether or not they are moving and the direction of the movement. Can easily be converted into a tracking and training system with the TEK Training Module (sold separately). Collar/receivers come as separate, compact modules that fit together on a single collar strap. DryTek® design ensures all components are waterproof and submersible to 25 feet. Integral, tilt-compensated compass. Minimum of 20 hours of usage on a single charge.