Despatched quickly. Used it directly off the car battery (Vauxhall Astra, 1.6 Petrol), used my laptop (60w) to watched a DVD and ran two (11w) energy saving light bulbs at the same time via a 18m extension lead while I was camping. The warning buzzer didn't sound (thats good, buzzes when batt is at 10.5v, then auto disconnects at 10v) and batt was ok, started car up straight away after use with no concern or hesitation. Inverter case can get fairly hot, otherwise, all good, highly recommended.
