This Bark Control system uses a harmless but distracting citronella scent of spray to deter unwanted barking. The light Receiver Collar is comfortable for dogs of all sizes. Includes 1 x Can. This collar is suitable for dogs over 2.7 kg and with a necksize of up to 60cm. It is easy to use and requires no programming. Gentle citronella spray interrupts nuisance barking. The collar has an on/off switch for longer battery life. Suitable for small, medium and large sized dogs. Manufacturers 3 year guarantee.