D.T. Systems DD700 Add-On Additional Collar Black DD ADDON-B

D.T. Systems DD700 Add-On Additional Collar Black DD ADDON-B. O.G. (Direct. Observe. Guide) Director 700 additional collar is meant to be an "Add-On" collar to your existing DD700 (each remote will work with up to 3 total collars). Specifications for D.T. Systems DD700 Add-On Additional Collar: Manufacturer: D.T. Systems Battery Type: Lithium Ion Battery Quantity: 1 Package Contents: D.T. Systems Add-On Replacement Collar Receiver D.T. Systems DD ADDON-B: DD700 Add-On Additional Collar Black