SG Timer Go

These are drop shipped directly from the manufacturer.

Here is a video:  SG Timer Go

This is an incredible timer that also works with dryfire practice.  

More info:

Extra loud buzzer.

Superior battery life.

High-res backlit screen, the largest ever on a shot timer.

Companion app, expanding the possibilities for training above and beyond.

One handed operation and intuitive interface.

The world's toughest shot timer body, immune to water.

Sensor, that hears what you want it to.