"Put the proven performance of Garmin GPS dog tracking technology and electronic dog training in your hands with the Alpha 10 GPS Dog Tracking and Training Control Unit. Designed with work with TT 15 collar units (not included) for tracking and training or T5 collar units (not included) for tracking only, this high performance handheld can help keep tabs on up to 20 dogs.Built around a 1.8"" screen, the Alpha 10 handheld unit helps you monitor your dog's location with multiple global navigation satellite systems (GPS and Galileo). The Alpha also allows you to track fellow hunters with Alpha units, for safer and more effective hunting. Offering up to 18 levels of continuous or momentary stimulation control, along with tone or vibration options, this unit offers easy training control with the push of a button. Easy-to-use control unit offers a top range of 9 miles with the TT 15 tracking and training collars or T5 tracking collars and a 4-mile range with the TT 15 Mini and T5 Mini collars. Compatible with the Garmin Explore app, as well as the Garmin Tread, DriveTrack 71, or Montana 700 Series handheld GPS navigators, the Alpha 10 system communicates with other Garmin devices so you can see real-time dog tracking information on your smartphone or GPS device. Built to go as long as you do, the Alpha 10 utilizes a rechargeable lithium-ion battery to offer up to 40 hours of runtime. Bluetooth wireless connection. Manufacturer model #: 010-02290-50. Handheld control for TT 15 tracking and training collars or T5 tracking collars (not included) Pinpoints the location of up to 20 dogs and/or fellow hunters with system units Training - 18 levels of continuous or momentary stimulation, as well as vibration or tone Works with Garmin Explore app and compatible Garmin GPS navigators Up to 9-mile range with full-size collar units or 4-mile range with Mini units 40-hour runtime on a full battery charge Bluetooth wireless connection"