I purchased this unit from Bang**** Products and had it delivered 3 days ago. Right away I noticed that the on off switch was unpredictable in what it would do when pressed. Sometimes I had to press it for about 7 seconds for the unit to respond and sometimes 30 to 60 seconds. Today, no matter how long I press the on off button the unit will not awaken. I have dont nothing to damage this unit and am waiting for a response from Bang**** as to what they will offer me in return, The device worked well until it wouldn’t work at all!