Aetertek At-216D-550s 600yard Remote Dog Training Shock Collar 100% Waterproof & Rechargeable Correcting Bad Behavious Jumping on People,Barking, Biting Etc Aetertek 216D 1 dog bark collar. 600Yard (550 meters) remote control range, and signal can pass through obstacles, such as walls and fences Small & lightweight rechargeable receiver,100% waterproof. 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. Adjustable TPU strap, it is suitable for small, medium and large dogs weighing from 15 to 150 lbs. 3 modes: Warning Beep Tone, Vibration, 7 levels of adjustable Shock. 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. Static shock at the highest intensity is adequate for extra large or stubborn dogs, and mildest shock will not harm even the smallest dogs