• Easy to install to your ProChrono Digital chronograph • Just attach the light bars to the chronograph guide wires, connect the power and you are ready to shoot • Infra-red LED design eliminates light bulbs • Dual voltage 100-240 volts AC,50-60Hz adapter included • Will also operate on a 24 volt DC source (ex. 2 - 12 volt batteries) • Red LED "ON" indicator lights