ITEM NAME:5V Electronic Relay Module 8-Channel Shield for 51 AVR ARM Logic G9W3 5V Electronic Relay Module 8-Channel Shield for 51 AVR ARM Logic G9W3 Product Name : 8-Channel Relay Module;Output Channel : 8 Power Supply : 5V;Load Voltage : AC 250V 10A,DC 30V 10A Total Size : 137mm x 56mm x 17mm/ 5.4" x 2.2" x 0.7" (L*W*H);Mounted Hole Size : 3mm/ 0.12" Mounted Hole Center Distance : 132 x 50mm/5.2" x 2"(L*W);Material : Electric Part color: blue Weight : 122g; 5V Electronic Relay Module 8-Channel Shield for 51 AVR ARM Logic Descriptions: 5V 8-Channel Relay interface board, and each one needs 15-20mA Driver Current. Standard interface that can be controlled directly by minicontroller (Arduino , 51, AVR, PIC, DSP, ARM, MSP430, TTL logic). Indication LEDrsquo; s for Relay output status. Package Content : 1 x 8-Channel Relay Module Note:Light shooting 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.