The SportDOG SDR-FC dog training collar works with the WetlandHunter™ 400 and WetlandHunter™ 800 systems. This Add-A-Dog collar has high-output and is waterproof. Designed with RealTree® Advantage Max-4HD camo, collar also has low battery detect feature, long-life replaceable, rechargeable NiMH battery, and comes with lifetime limited warranty - This collar also compatible with other SportDOG products such as FieldTrainer, SportHunter, HoundHunter and ProHunter transmitters.