This devious trainer device provides plenty of shock for your pup. Offers effective training via electro stimulation, vibration, audio tones, and visual cues. There is a corresponding button for each training method on the long-range wireless remote. Works up to 250 metres away! The adjustable rolling buckle supports a padlock for the option to turn this into a locking collar. Padlock sold separately Measurements: Fits necks up to 50 cm in circumference Material: ABS, nylon, metal, leatherette Colour: Black Note: Controller requires 9v battery, not included. Locks sold separately.