Introduction - If you have any usage issues, please Google them yourself
Use of STC to achieve four digits 4 lock function, and displayed on a digital pipe. Follows K1, K2, K3, K4, representing key figures 1,2,3,4, K5 is OK button, if you enter the correct password for the user is stored, the LED on the implementation of SCM light off circulation features, such as mistyped 3, LED, etc. are all bright.