Extra Dog Tracking transmitter for use with Astro System - to track multiple dogs The DC-20 is the key to watching your dog's activity. This small unit attached to your best friend is a transmitter that relays dog-status information to your handheld. It has an update rate as often as every 5 seconds and reaches up to a 5-mile range. You will know if your dog is pointing, sitting, moving, or treeing game. Where he's at; where he's been; how fast he's moving and how far he's gone. Wireless collar transmitter. Goes where your dog goes - thick, tangled grass, dense foliage, overhead tree cover, No problem. Rugged on/off button. IPX7 Waterproof Case. Flexible, removable VHF Antenna. Internal GPS Antenna. Weighs 6 ounces. 3.25" Wide x 1.75" Height x 1.50" Deep. Rechargeable litium-ion battery pack. DC-20 can easily be fastened to an existing electronic dog collar utilizing a 1" collar strap (just use the included collar attachment plate). If no e-collar is used, we recommend using an optional "dummy collar" or the inlcuded Garmin harness to hold the DC-20 transmitter in place for effective tracking. -------------------------------------------------------------------------------- In the Box •DC-20 •Dog Harness •AC Adapter •Vehicle Power Cable •VHF Antenna •Collar Attachment Plate •Set-Up Guide