Designers Edge L1799 Indoor Emergency Light Lights come on automatically when the power fails Single Head provides 4 hours, Dual Head Provides 2 Hours of light No wiring or assembly needed, plug in the 18/3 SJT 6FT Cord to power supply Comes with 2 incandescent 6-volt 0.8-amp T5 Incandescent wedge base bulbs Provides years of maintenance free use, includes 6 volt Rechargeable Battery