Electric Light Brick 1x2 with Lamp on Side (6034/6035), LEGO® Part# 6035c01. Appears in classic town, classic space, and other LEGO® themes from the 1980s and 1990s. This part is powered by part# 4760c01 (Electric 9V Battery Box Small Assembly). Comes in white. 

Each one has been tested to ensure they work. 

To learn more about the parts we offer or if you have any questions call us at our storefront at 470-414-2208 and we'll be happy to help.