Dog Training Collar 800M Remote Transmitter for M880-1/M880-2/M880-3

I bought this system for my cat. It was a must as my neighbors standard poodle wanted to kill her, day 1!(Guess who's yard my cat wanted to be in constantly?)It was very easy to install and training was a breeze.It's worked perfectly for 3 months! I just changed the battery for the first time.IMPORTANT!Remember to always check the setting (number of blinks) after you change the battery.If you had it set to "high", it will reset to "0".Your pet escaping your boundaries is no way to find out that mistake!