1Short cycle with reasonable price 2.Excellent service 3.Punctual Voltage:3V Certificate: CE ,ROHS, ISO, VDE, UL,SGS. Power supply :AA battery or AAA battery. Remote distance: More than 15 metres long. Operation Panel: Clearly printing and easy control panel. Component: high speed chip make the reflection more quickly. Payment:30% deposit for the order, other 70%pay before shippment.