pi-lit®'s Type AC Lamp is a three position lamp that allows the user to have a flashing Type A lamp and a Steady Type C Lamp in a single lamp. Designed to flash "Night Only", the Type AC will automatically turn off the it's flashing during bright sunlight hours, prolonging battery life. Available in three options: 3-Volt Alkaline D Cell, 6-Volt, and True Solar Rechargeable. Meets MUTCD and ITE Specifications. USA Assembled, Supported, Designed. Sold in boxes of 10 lamps