I am looking to buy an SD card for my Canon Powershot SD400, but I am seeing "Operation Voltage : 2.7 ~ 3.6 V". http://canadacomputers.com/index.php?do=ShowProduct&cmd=pd&pid=005210&cid=990.218 Now, how do I know that this will work with my digicam? I have read the SD Card section in the manual, but there is nothing about the volatge. Any advice? Any ideas?