You can charge them via USB and they last a week 24/7 each. They also have a little switch to turn them on and off if you want and they last even longer. However, as the title of this short article suggests, the solar charging feature isn't worth a damn. But I use them anyway, if only because of the flashing LED and the hopefully deterrent effect. One day if they keep working I'll have to hack them to change the batteries but so far they're still holding a very good charge. Overall I am very happy with this purchase for the money.
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