BUYER BEWARE! I ordered a Quad DVT modulator from Systemsat but I was worried I had accidentally purchased the wrong model so I contacted them immediately via their website (they have no email address) to cancel my purchase. I heard nothing. A few days later the modulator arrived so I contacted them via their website messaging system again 3 times and left a message on their telephone answering machine to return it and nearly a week has passed now and I have still heard nothing. Alarm bells started ringing in my head and I have just read all of the negative reviews about Systemsat which after my experience came to no surprise. Luckily I have managed to set the modulator up and get it working with help from my friend. Should I have further problems with the equipment I did Make the purchase with my credit card so I do have additional support plus a letter sent to trading standards should be suffice. Disgusted!