Features: With this dog trainer, dogs quickly learn to associate tones or vibrations with stimuli and quickly respond accordingly. The effective remote control distance is up to 500 meters, enabling long-distance remote control. There are three training modes: beep, shock and vibration, which can be switched at will. The round appearance comes with a lanyard that you can hang around your neck to prevent loss, which is very convenient. The display icon is colored and can train up to 3 dogs (3 collars need to be purchased). The remote control and receiver of this dog trainer are both rechargeable and have long-lasting battery life. This dog trainer is waterproof and dogs can wear it to swim, bathe and enjoy outdoor activities comfortably. Suitable for dogs from 5lbs to 140lbs. Specification: Model: T11 Color: blackcamouflage color Material: plastic Battery: 350Mah Package size: 18 * 6 * 6cm Package weight: 266g Packing List: 1 * Remote Control 1 * Receiver 2 * Extended Silicone Cover 2