The Leuchtie German engineered LED dog collar has no fiddly buttons, buckles, or switches, simply slip it over the dogs head & the intelligent sensor switches on the collar. To turn off simply slip it off the dogs head & it will turn itself off after a couple of minutes! IMPORTANT When choosing the size of your collar, measure the dogs HEAD & NOT the neck, the collar is designed to just slip on & off over the dogs head. If your pooch loves technology & fashion then this is THE collar to have. Requires 2 x AAA battery (included) * PLEASE READ THE INSTRUCTIONS WHEN YOU FIRST RECEIVE THIS COLLAR, IF OPENED AT THE WRONG END YOU WILL BREAK YOUR COLLAR & VOID THE WARRANTY (There is a battery saver in the collar to stop it being activated in transport, which needs to be removed when you first receive it, it is important that you open the correct end of your collar to remove this, forcing open the wrong end will permanently damage it, it is easy to get to but you need to read the instructions to show you which end has the batteries!)