"Monitor your dog's health while training and hunting like never before using the innovative SportDOG Brand FieldSentinel 1825 Electronic Dog-Training System. Passionate dogs go all out in pursuit of birds, without much regard to their own wellbeing. Keep them safe with the world's first remote trainer with health alerts. BodyGuard technology features real-time monitoring to alert you when to check your dog before a problem ends the hunt. Think of this system like a check engine light for your dog. Select between tone, vibration, and 7 static stimulation levels to customize training. Remote and collar have a waterproof design submersible to 3'. Also features half a mile range. System can be expanded to 2 dogs with an additional collar (not included). Switch between dogs with the toggle switch on the remote. Lithium-ion rechargeable batteries feature 2-hour quick charge and low-battery indicators. Expect run time of 24 hours from a full charge. Collar fits dogs 8 lbs. or larger with 5""-22"" neck sizes. SportDOG Brand FieldSentinel Electronic Dog-Training System includes remote transmitter with removable Antenna, receiver on black 1"" collar strap, charging cords, test light tool, lanyard, belt clip, carabiner, replacement mud plugs, and quick start guide. Collar without strap measures 3.7""L x 1.96""W x 1.53""D. Remote with antenna measures 6.23""L x 2.1""W x 1.22""D. BodyGuard technology for real-time health monitoring Tone, vibration, and 7 static stimulation Waterproof design submersible to 3' Half a mile range 2-hour quick charge Includes receiver collar and remote transmitter"