Supertron Electronics Ltd. Offers Easy to Install USB Casing 3.5. Supertron Electronics Ltd. Is an ISO 9001:2000 certified company. Easy to Install USB Casing 3.5 is riverless, except for Windows 98. The maximum support capacity of the product is 200GB. It requires external power supply. Easy to Install USB Casing 3.5 incorporates USB2.0 and is a high speed device having a speed of 480 mbps.