Best-in-class Dog Training System with Simple GPS Tracking: One-handed, no-look training for up to 3 dogs with a range of up to 9 miles and a 2.5-second update rate for fast location tracking. Customize training with 18 levels of continuous and momentary stimulation, tone, and vibration. The built-in display shows directional GPS and GLONASS tracking so you know where your dogs are at a glance. Easy pairing and setup with compatible Garmin collars (sold separately). The rechargeable battery lasts up to 24 hours. Designed for tough environments with a tube-shaped transmitter that’s simple to operate one-handed. Compatible with fēnix® watches, Tread®, DriveTrack™ 71, Montana® 700 Series, and the Garmin Explore™ app for real-time tracking on your mobile device. Specs: dimensions 1.8"x11.4"x2.1", display resolution 128x128 pixels, weight 8.9 oz, water rating IPX7, floats. Includes PRO 550 Plus handheld, AC adapter, and documentation.