This sale is for the replacement/additional FENCE REMOTE CONTROLLER for GROOVYPETS GP113FR Fence and remote trainer model GP113FR. Instructions to un-sync and re-sync a receiver with remote controller: To un-sync the collar, turn on both collar receiver and remote, push and hold BELL and SHOCK button at the same time till the numbers on screen changing rapidly. Then push Channel 1 to unpair the collar. You will hear 5 beeps. Make sure the remote's antenna is close the receiver (within a few inches). Push and hold BELL button and SHOCK button again to stop the changing numbers on screen. Now the collar is ready to re-sync with remote. To re-sync remote with an un-synced collar, turn the receiver on first, the green light flashes rapidly (ready to sync status). Turn on remote controller, push and hold down SHOCK button and "+"button at the same time till the display will show rapid changing of numbers. Place the remote really close to the receiver's green light (like less than 1" or 2 centimeters), push the button "1" or any one of the other two "2, or 3". You will hear 5 beeping sound. At this point, receiver is synced with remote controller. To stop rapid changing of numbers on remote controller, simply push and hold down SHOCK button and "+" button again. Free USPS 1ST class mail or low cost via USPS PRIORITY MAIL or EXPRESS MAIL. Buyers will receive an email with tracking info immediately after order is processed. International buyer will receive your order typically within 14-21 days via USPS 1ST CLASS MAIL or 7-10 days via USPS Priority mail or 5-7 days via USPS International Express mail. MONEY BACK GUARANTEE. REPLACE ANY FAULTY PARTS WITHIN ONE YEAR WARRANTY PERIOD.