Fully adjustable collar for small or large dogs. Collar and remote are rechargeable. Dont worry about replacing batteries! Plug it into the charger and you are set for your next training session. Features: THREE TRAINING MODES: Beep, Vibration, Static Shock. Remote Control Details: Frequency: 433.825MHZ, 3.7V 500ma lip, 3.7V 500ma lip OBEDIENCE: Quickly and safely train your pet to follow your instructions without worrying. Package Includes: 1-Pack: 1 Collar, 1 Remote, 1 USB Cord, and 1 Wall Ada