1Operating voltage is DC 12V. 2Operating current: Standby current (digital tube OFF) 12MA, standby current 48MA (digital tube ON), 1 relay ON 76MA, 2 relays ON 104MA, 3 relays ON 131MA, 4 relays ON 162MA,5 relays ON 184MA, 6 relays ON 209MA, 7 relays ON 255MA, 8 relays ON 288MA. 3On-board resources: 8x opto-isolated inputs, 4x buttons, 1x 4 bit digital tube display, 1 pair of Pro Mini slots, 8 relay outputs. 4Military grade double sided circuit board, with stable performance and long lifespan. 5Applicable for timing ON/OFF, motor forward and reverse rotation, cycle delay, etc. Item Type: 8 Channel Pro Mini PLC Relay Shield ModuleOption:8 Channel Pro Mini PLC Relay Board,8 Channel Pro Mini PLC Relay Board + Pro Mini Board, 8 Channel Pro Mini PLC Relay Board + Pro Mini Board + Pro Mini Download Cable (CH340 USB to TTL232) We provide the code(skit) can only achieve a simple delay function,the delay time is adjusted by modifying the delay parameter of the code(sketch). If you need more functionality, write your own code. We do not provide additional code(sketch) and technical support. How to use:See video ''IO22C04 pro mini delay relay demo'' (You can search for videos on for GOOGLE) Application Examples:Motor forward and reverse, Timing on, Timing off, Power-up delay, Trigger delay, Infinite cycle delay, A finite number of cycle delay, Power sequencer border: 1px solid000important;}1 x 8 Channel Pro Mini PLC Relay Board1 x Pro Mini Board1 x Pro Mini Download Cable (CH340 USB to TTL232)IO22D08 can not work independently, must be under the control of the Pro mini board to work,If you do not have a Pro mini board, Please purchase the kit ''RelayBoard ProMini''