Vktech&reg; EV1527 12V 4Keys ASK Metal Wireless Remote Control Learning Code (315MHz) Working voltage: DC12V(27A/12V battery x1, Included) Modulation mode: ASK (Amplitude Modulation) Emission Distance: 20-50m (Open area), Working chip: EV1527 Encoding type: Learning Code, Size: 55*30*14mm Uses: Family, shopping malls anti-theft alarm system, electric vehicles, automotive, motorcycle alar