This can usually be found on the manufacturer's website or in the specifications section of the user guide (if it came with one of course).
Nke a nwere ike ịchọta ya na ebe nrụọrụ weebụ ma ọ bụ na ngalaba nkọwa nke nduzi onye ọrụ (ma ọ bụrụ na ọ bịara na nke otu).