Vastar Rechargeable Remote Control Dog Training Shock Collar Remote Dog Training Collar with Advanced RF 434Mhz Technology, boosts range up to 330 yards. Rechargeable and Water-resistant collar receiver and transmitter Separate Buttons for Collar Tone, Vibration and Shock Corrections;Just press the button and you can training the dog directly. 16 levels of static shock and vibration stimulation Remote control with blue backlight screen for night using The remote control and the receiver had been paired before packaged;You just need to turn on the receiver and the remote, the training system will work for you Dog E-collar fits all dogs. From 25 to 100 lbs with a TPU collar size from 11 to 22 inches long