The small, sleek collar receiver features a li-ion battery that charges in two hours and has a One to Two-Month battery life. Now featuring seven levels of static stimulation as well as Vibration and tone, it's easier than ever to keep your dog safe and secure. With 1, 000 FEET of wire and 100 flags included, you can contain an area as large as 1 1/3 acres (or up to 100 acres with the purchase of additional wire and flags). Simply purchase additional collars for multiple pets. Dependable in any environment, the collar features dryer technology making it waterproof and submersible to 25 feet. The In-Ground Fence with rechargeable collar and upgraded technology (not compatible with SDF-100A or SDF-CT) that has 7 levels of static stimulation with vibrate (Buzz)/ tone (beep) warning. Anti-linger feature prevents dogs from standing in the warning zone to drain the collar battery. With a 2-year manufacturer's warranty, the In-Ground Fence is designed for our products in the field, with heat, cold, rain, snow, dust, mud, and wind in mind, (tested in the potential extreme weather conditions faced while hunting). SportDOG has become one of the most recognized brand in the electronic tracking and training categories, making the promise to always create ""Gear the way you'd design it."