Aetertek AT-216D Professional Rechargeable 600 Yard Remote Dog Training Shock Collar,Beep ,Vibrate and 7 Levels Adjustable (Two dogs training system) Aetertek 2017 Newest model 216D (updated 216). Effective 3 training modes: Beep Tone attention, Vibration Warning, 7 levels of adjustable Shock. 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 Adjustable TPU strap, it is suitable for small, medium and large dogs weighing from 15 to 150 lbs. receivers using 5.0MM pore size on charging port which can be charged repeatedly and never deformation and worn, 100% Safety and reliability. Rechargeable & 100% waterproof (submersible).600Yard (550M)remote control range,remote with auto sleep feature,save battery 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. . Avoid the unstable, ageing and mechanical damage for waterproof structure, to ensure the collar with excellent waterproof performance.