???ng ?i?n khu v?c b?m: Ch?n máy b?m d?u 24V, 12V n?u khu v?c b?m xa ngu?n ?i?n, ch?n máy b?m 220V, 380V n?u ???ng ?i?n ti?n l?i thì máy b?m s? kh?e h?nAll information and knowledge is supplied “as is” for private informational functions only, and isn't intended to be economical tips neither is it for buying and selling purposes or expendit