Feature: 1. EIGHT MONTHS OF EFFICACY: Pet collar kills insect by contact for up to eight months, stopping the problem at its source. 2. SLOW RELEASE TECHNOLOGY: Slow release controls the release of both active ingredients at low doses to ensure your pet is continuously protected. 3. SOFT AND WATERPROOF: Adjustable pet collar is made of TPR silicone, which is soft and waterproof and comfortable for pets to wear. 4. SAFE AND ODORLESS: Pet collar is safe, non toxic and odorless, and can be used by families with children without causing harm to the human body. 5. EASY TO PUT ON AND TAKE OFF: Safe pet collar can be worn for long periods of time and is easy to put on and take off to help your pup fight off pesky pests. Specification: Item Type: Pet Collar Material: TPR Silicone, Effective Drug Powder Product Weight: 50g/1.8oz Duration Of Action Of The Powder: About 8 Months. Package List: 1 x Pet Collar 1 x Iron Box Note: Please allow some error due to manual measurement.