The battery life of any tracking device will determine if you get your hound home safe. All the claims of extended life, sleep mode, on and on, don't mean a thing when you cannot get a signal on your dog. Garmin and GPS equipment out there are the best tools to come along in a long time. We remember before tracking collars, you spent more time hunting your dogs then hunting. Just remember - if you have a hound that will bay up game in say - a culvert. If you have the kind of dog that will stay in the game's face until it no longer has a voice - then your GPS will probably be dead. Put a West Coast Telemetry Tag-A-Long on the same strap as your GPS and you will have a back up in case that GPS goes dead. 8,000 hours works out to be almost a year. If you haven't found your dog by then chances are you never will. $99 is small price to pay for peace of mind.