Ok to wake red/green clock

Has anyone found a good ‘ok to wake’ clock for their toddler? The ones that are red throughout the night and then turn green in the morning to let the child know it’s ok to get out of bed. No alarm sound just the color! I found a bunch on amazon but they all require cords which I don’t want (strangulation hazard). I’d love any recommendations! Or something similar that’s worked for you