Lasts about four and a half minutes in the hands of a 3 year old. When receiving with diopter adjustment and focusing on an object 25 feet away, everything looked normal, acceptable for children's entertainment. Five minutes later, my kid told me there was something wrong with the glass. Upon inspection it was found that all of the lenses inside had failed, with a lot of image vignetting and a small opening to look through. Garbage. To return.
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