This is One piece New, not used Kuzma Strobi Strobe Discs/LP Record weight.

Green Light ON - 33.3 rpm

Red Light ON - 45 rpm

When the green light is on, the speedometer is ready for 33.3rpm testing application.  

To change it to the 45 rpm testing, simply take out the speedometer and gently shake back and forth once, then the red light is on and the green light is off and is ready for the 45 rpm testing.

The speedometer will automatically switch to the standby mode after 5 minutes of continuous usage.  Also, turning the speedometer upside down 5 seconds will get it to standby mode.

Once in standby mode, simply shake it back and forth once to re-activate and it should be ready for testing applications again.

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