Too bad the manual is in English only but a little fiddling you come to understand the operation. The remote control is well understood how it works I synced by against each collar a little without meaning like "hold the on / off button the collar support and a command button and a long beep / vibrate indicates that the control is synchronized with the necklace. " Should be checked at each refill (before putting the collar on the dog) that the collar is always synchronized, otherwise it is all clamps that meet at the same time! Moreover they hold several days on (without using or two / three correction) and they are quickly recharged kind not even 3 hours. moreover when it is recharged a steady blue light. From what I understand flood must not let the plug support more than 4 hours max. So I do not regret my choice, necklaces are sturdy and the receiver is not likely to get lost as some competitors and the price and really affordable! I had a dog canicom2000 lost (because of poor clamping pfff) and nothing but the necklace is worth a hundred uros therefore there in the absolute, if a necklace is lost it hurts less.
