Pear Blossom Press One Light - 3 pack All-in-one light-up units, each with one bright white LED, batteries included. Each unit already has the light attached; no circuit building is required! These are perfect to nestle between the layers of your box cards, pop-ups, and other cards that would otherwise be very difficult to light up. Each unit measures approximately 1" x 1 3/8" and includes a CR2016 coin cell battery.