The Hound Hunter SDR-AH collar allows you to add another dog to your remote tracking system, or replace a lost or broken collar. This collar is compatible with SD-3225 , SD-1225, SD-1825 and SD-1825 Camo. This collar features DryTek waterproof design technology, rendering it waterproof and is submersible up to 25 ft. When coupled with your remote trainer, you can send up to 8 levels of corrections across 2 miles. The rechargeable battery lasts for 40-60 hours. Charging cradle is included and will charge up this collar in 2 hours. Original collar receiver for HoundHunter 3225 Features DryTek Waterproof design Technology, rendering it waterproof and submersible to 25 ft. 2 hour charging time 40-60 hour battery life Charging cradle included