This is a compact but solidly constructed extension block. It's a slightly different design from others I have in that the 6 sockets are upside down. If you're using it with normal mains plugs, this is not really a problem. It's also fine if you're using the types of plug-in power bricks that don't extend above the earth pin. However, I have a hard drive power brick where the mains plug is mounted at the bottom, and another where the lead emerges from the top of the brick, above the earth pin. These can't be used with this extension unit, at least not without the whole thing tilting over to one side.
There are two USB charging ports on the top, each with a 1 Amp output. I tried charging my iPad 2 with it and found that the iPad's charging symbol came on, though (not surprisingly) charging proceeded much more slowly than with the 2.5 Amp charger that Apple supply. My mobile phone would not charge at all.
The two circles at the other end from the USB ports are indicator lights: a blue power light and a white surge protection light. There's no power switch on the unit itself. Personally, I prefer that, as some extension blocks I've used have had power switches so sensitive they've been triggered by accident when inserting a plug, or even by a cat walking over them.
The technical specs (copied from the instruction leaflet) are:
Protection: 3 x 14 MOV
Maximum Surge Energy: 375 Joules
Maximum Surge Current: 13500 Amps
Clamping Voltage: 775 Volts
Response Time: <50nS
Thermal Cut-Out: Yes
Protection: L-N, L-E, N-E
Maximum Total Load: 13 Amps = 3120 Watts 240 Volts AC
Masterplug say that they "will replace ANY equipment damaged as a result of a surge or spike whilst connected to the mains by our equipments (sic)." They add, however, that "This device is not a lightning arrester and will not protect equipment against lightning strikes."