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