The principle is a small DC motor, which drives the motor rotor to do magnetic cutting through gears (instead of friction electrification, which means it's time to review junior high school physics) to generate alternating current, and after rectification and voltage stabilization, a stable DC voltage (which means it's also necessary to review junior high school physics)
As mentioned earlier, it is used in emergency, and only needs to be charged.
Of course, it's charged while shaking, and it's less than 1% cheaper (of course, such parameters are not guaranteed, and it's like what the second floor says). It costs tens of yuan to make it with a three-phase motor, so it's easy to shake with high power and has a long life.
damage to the mobile phone, I still say that for qualified products, don't treat it as an ordinary charger, it's just an emergency product. Even if you charge more batteries in an ordinary charger, it will age and reduce its capacity. Junk products will not be evaluated
,
If you are in a place without electricity, there is no place for your mobile phone to charge, and you need to make a phone call urgently, then you will realize the real use of this product. Buying a product depends on whether it is useful to you. If it is useless to you, it is a waste product no matter how good it is.