The Dogtra STB BEEPER  COLLAR with 2 versions to choose from has  Microcomputer Technology To Create Distinctly Different Sounds.

It Is Also Equipped With The Piezoelectric Sensor For The Most Accurate Motion Detection Of The Beeper Modes For Point-Only And Run/Point.

The Dogtra StB collar emits distinctive beeps so that you can easily locate the dog by sound. It is lightweight, durable and easy to use.

THIS IS A GREAT COLLAR FOR THOSE WITH HEARING LOSS!

THIS IS NOT AN ELECTRIC COLLAR!  THIS IS A LOCATION COLLAR!  IT EMITS AN AUDIBLE SOUND.

"The Dogtra StB-Hawk has two operating modes: "Run/Point” and "Point Only”.In the ‘Run/Point’ mode, the beeper collar emits a double beep every 7 seconds while the dog is moving. Then, it will change automatically to a beep sound every 2 seconds when the dog is on point.
In the ‘Point Only’ mode, the beeper collar remains silent when the dog is moving. When the dog goes on point, the beeper collar will emit a beep sound (or hawk sound, if this option has been chosen) every 2 seconds until the dog starts moving again".