Lee Electric, 302, 2-1/2" General All Purpose Electric Door Bell, for use with battery or transformer 8 to 16 volt AC, 3 to 6 volt DC, Easy to install. AC and DC Models. Low Voltage. Exposed gong. Attractive snap-on covers. Enclosed binding posts. Corrosion resistant metallic finish. Low cost, non adjustable bell which may be operated off of a 590 transformer or DC power. Universal economy bell widely used in homes, apartment houses, plants, OEMs. Especially suitable for AC powered systems with battery standby.