2016 Upgraded Aetertek AT-918C-1 4 in 1 Remote Shock Control Rechargeable and Waterproof Pet Dog Training Collar with Shock, Vibrate and Beep Dog Brak Collar for 1 Dog, Electronic Dog Training Shock Collar Updated version of AT-918 dog trainer, with advanced appearance and performance Professional training collar with Rechargeable and 100% waterproof receiver Control 1 or 2 dogs separately or simultaneously, 600 yards remote control electric shock devices with 5 unique design:Auto anti bark, Vibration, Beep, adjustable Shock, big and easy to push rubber button With adjustable TPU strap length from 6-25"/15cm-65cm, suitable for all dog size from 15-150lbs, especially for medium or large hunting dogs Comes with 6 months quality warranty