Specification and Feature: -The conductive rubber electrode is soft and the static impulse can penetrate the hair of the pet. It is comfortable for the pet to wear. -The strongest static impulse can quickly and effectively curb the improper deeds of the pet. -Power-saving mode of receiver prolongs the life of the battery. -The soft remote controller antenna is anti-broken. -Adjustable collar length (from 12" to 20") fits different size of dogs. -Ultra light collar receiver Collar Receiver: Length: 60mm Height: 30mm Width: 35mm. Weight: 70 g (with battery) Collar length: adjustable from 12” to 20” Power: One 6V 4LR44 camera battery (four start-up batteries are included). Remote Control: Length: 120mm Height: 25mm Width: 45mm. Weight: 100g (with battery) Power: 9V battery (included) Package detail: Multi-function training collar device X 1 Remote control unit X 1 Adjustable snap-on/off collar X 1 Collar testing unit (Clips to collar and lights up to tell you the shock action is operating) X 1 Operating Instructions X 1 4LR44 camera battery X 2 9V battery X 1 42PCS/CTN 44*34*34cm G.W:14kg N.W:13kg Note: -The battery life depends on the usage of the remote and the collar. -Please take the collar off and turn it off to save the battery when you are not training the dog. -Do not let your dog to wear the collar all the time. -The 6V battery that is included in the package is for start-up purpose only, and it may not last for a long time (depending on the usage of the collar).