Using high-performance high-efficiency transformer, output of high efficiency and less heat, low noise. With time difference to achieve unlocking the electric lock first and Manual open the autodoor. With one group of relay contact signal output,suitable to meet the needs of unlocking the electric lock and opening the autodoor . With operation indicator to confirm the validity of every actions. DC 12V 8A Access Control Power Supplier Converter Transformer Input AC 220V Delay Time Adjuster for Door Access Control System Using high-performance high-efficiency transformer, output of high efficiency and less heat, low noise. With time difference to achieve unlocking the electric lock first and Manual open the autodoor. With one group of relay contact signal output,suitable to meet the needs of unlocking the electric lock and opening the autodoor . With operation indicator to confirm the validity of every actions. With delayed contact signal output, this product can be used as signal converter to connect with other controls. Timing control to adjust opening time from 1-15S . Color: As Shown Material: plastic Package Contents: 1*DC 12V 8A Power Supply Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.