Regarding electrical signals as input

I want to Pass electrical signals as input to my bolt in A0 pin
if i pass that electrical signals as input, will it cause any damage to my bolt circuit?
if not, how many volts can be passed as input (Maximum) ?

I think maximum electrical signals you could pass is around 5 volts.
Because unlike arduino it doesnt have a inbuilt voltage regulator.So if you give more than that your bolt may damage.

I think your charger are passes the more 5 voltage then damage your bolt kit