Supply voltage: |  			 			+ 5V DC + / - 5% |  		
 			Communication interface: |  			 			USB or PS2 (optional) |  		
 			Protection grade: |  			 			IP65 (front panel) |  		
 			Operating temperature: |  			 			- 40 ~ + 70 |  		
 			Storage temperature: |  			 			- 50 ~ + 80 |  		
