Wire-Free (100% No Wire) 2 Dog Fence Wireless Pet Containment System - Rechargeable Water Resistant Receiver Collar & Radial-Shape Circular Boundary Perimeter Radio Wi-Fi Transmitter for Safe Training Troubleshooting guide is provided in the last image on the left and PDF version will be emailed to you upon product purchase or request. 2 x Pet Collar: Fits Dogs 8 Pounds and Up with Neck Sizes from 6 to 26 Inches (Small/Medium/Large/Extra Large Dogs). Coverage Area is Adjustable Level 1-100 Up To 1000 Foot Diameter at Max Setting.Make sure that the transmitter is 3 feet from the large metal objects and 5 feet of the ground for a stable signal bradcast Collar Receiver is Rechargeable, Water Resistant and Rain proof with Low Battery Indicator. Receiver Delivers Safe Static Correction Shock Stimulation When Pet Strays Into Warning Zone. Multiple Collar System Where 1 Transmitter Can Pair Up With Infinite Number of Receiver Collars. Power On the Transmitter and Receiver by pressing ON/OFF button for about 3 seconds. You will hear a beep sound. 2 Dog System - Wireless Pet Containment System with Easy Installation. Cordless with No Wires to Bury. 100% Safe and Effective Wire-Free Pet Fence. Patented Compact WiFi Radio Transmitter and Receiver Collar.Make sure to set the transmitter power level to 20 or higher.