The CIRCUITRON EF -1 Emergency Flashers are low cost circuits designed to alternately flash two Light Emitting Diodes at a constant rate. These units will add incredible action and excitement to emergency vehicles, barricades, signs, towers, etc. The EF-1 features an ultrasimple four wire hookup and may be powered by a 9 volt battery or with a PS-3 Power Supply Adapter.
The EF-1 measures 1” square.