Bearmax Eletric Wireless Dog Fence Upgraded Indoor and Outdoor Containment System Rechargeable Dog Fence Wireless Pet Containment System Safe & Easy Install Radio Wireless Pet Containment System 2 dog remote trainer Kindly follow the directions to Kindly follow the directions to use send out training commands without looking at the Transmitter PACKAGE INCLUDES: 1x Wireless Transmitter Unit 1x Collar Receiver 20 x Training Flags 1 Extra Pairs Collar Contacts 1x Test Light 1x Transmitter Wall Mount Screws 1x Power Adapter for Transmitter 1x Power Adapter for Collar Receiver REVOLUTIONARY Patented compact wifi radio transmitter (NOT RECHARGEABLE) and receiver collar (RECHARGEABLE) our product comes with an anti over shocking design that will only shock your dog for a defined time "54 SECONDS MAX" when he is outside the boundary zone or when he is not receiving any signal (behind trees