Features: adjustable anti fleas & ticks collar By emitting a (to fleas, anyway) gas to kill all stages of flea life cyle Able to kill fleas, ticks and mosquitoes plus flea eggs Effective within 24 hours of application and lasts for up to 4 months - 1 year Works on pet and his environment, including bedding and sleeping areas Buckle fastened that not easily to get rid of by your pets Flexible nylon handle won't upset your pet Easy to put on/ take off Take it off when taking shower for your pet to keep the collar effective as long as possible Note: Used only on puppies aged six weeks and over Keep out of the reach of children Size:33cm,42cm(Please choose according to your pet neck size) Package include:1 x Pet Anti Fleas Collar Note: 1. The color is just for reference only. It may slightly different from real item. 2. Please allow the size for 1-3cm difference due to manual measurement. Thank you!