Aetertek At-216D Waterproof 550m Remote Control Add-on Receiver 550 meters remote control range. 7 Levels shock+Beep+Vibrate Small & lightweight rechargeable receiver Adjustable TPU strap, it is suitable for small, medium and large dogs weighing from 15 to 150 lbs. Aetertek receivers DC base adopt embedded injection molding process, and equipped with high-precision-waterproof ring with built-in guide slot , ensured waterproof effect over 3 hours underwater 50cm. No leaking concern when pet in the shower, swimming, diving and other under water condition Aetertek collar use the most advanced design, electromagnetic induction switch solution, on the power ON/OFF switch to ensure unlimited accurate switch, more convenient and reliable.