In-Ground Electric Digital Dog Pet Fence Shock Wireless Waterproof 2 Collars Read the instruction manual carefully before use. The electronic collar is for dogs only. DO NOT test or set up system while the collar is on the dog. Make sure to replace the batteries when they are low to avoid irregular operation. Prior to system activation, allow your pet to wear the collar for several days to get used to it, and also to prevent negative association with the collar and the correction system. The dog should NOT wear the collar for more than 12 hours at a time. Supervise your dog at all times while the correction collar is on. This is especially encouraged for the first few times. Include:1 Black Indoor wall-mounted transmitter (NOT WATERPROOF. KEEP DRY AT ALL TIMES); 2 Black Rechargeable and waterproof collar receivers; 2 Orange waterproof adjustable receiver collar (64cm/ 25inch long approx.); 20 Orange Training flags (15 cm/ 6 inch long approx.); 1 boundary wire (300 meters); 2 Extra metal contact points pack; 2 Test bulbs; 1 Screws pack; 1 User's manual.; 1 AC adaptor; 1 Power plug; 2 USB charging Cable