These glow in the dark house numbers glow forever And without putting a strain on your electric bill. These large glowing house numbers feature a builtin luminescence that absolutely never wears out. No batteries or bulbs to replace. During the day they're easy to read while they recharge in the daylight. At night they glow brightly, making it a cinch to find your house in the dark. Durable 4" x 2" laminated sheets have nail holes for secure hanging. Or choose to use the peeloff pressuresensitive backing for easy hanging as adhesive mailbox numbers or door number stickers.