Garmin Alpha 300 Bundle Kit with Standard TT25To add additional Standard TT25 dog devices, click here. This is for the purchase of an Alpha 300 Handheld with TT25 track and train dog devices with Standard TT25. Expands up to 20 dog devices. This system tracks and trains for up to 9 miles. Bundle Kit Includes: 1 Alpha 300 handheld 1 VHF Antenna for handheld 1 Alpha TT25 dog device with rechargeable lithium ion battery pack (to add more Standard TT25 dog devices click here) 1 1 Inch ECollar Strap