Details: Length of collar: 70 cm For dogs: older than 7 weeks, above 18 lbs weight (8kg)  Version: English language on the tin, without reflectors Action The collar is designed in such a way as to safely remain in place for up to 8 months. Hertz is a unique product on the market, it contains a powerful insecticide thats made from Natural plant extracts. These compounds are incorporated into a polymer matrix used in the construction of the innovative collar waterproof and odorless, so that the active ingredients are for up to 8 months - released in a suitable low but effective dosage. Use For treatment and prevention of infestation of fleas (Ctenocephalides felis) for a period of 7 to 8 months for dogs. The effectiveness is reached immediately after putting on the collar. Hertz can be used as part of a strategy to combat flea allergy dermatitis (FAD). Kills fleas, repels and kills ticks - If a tick is repelled or killed, it can't attach and transmit the organisms that may cause disease. Non-greasy, odorless, easy-to-use. Water resistant