These LED keychains are not the usual ones you see, NO these are "ice cubes" or "chocolate" keychain lights.
They come in 4 packs for 2,98$ shipped
they measure about a square inch (2,5x2,5cm) and feature a 20000mcd led emitter powered by 2 2016Li batteries that are included and should last like 5hrs.
unfortunately the power switch is only temporary not permanent.
power should be around 10 lumens or so like the other ones I reviewed, not bad actually
nice addition to your keychain, camping kit as emergency lights, backup lights, gifts etc...
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