Fake memory cards are on the market and can be obtained very cheap. Do you know how to spot a fake one from a genuine one? How do you know the ones on sale or on promotion are not fake ones?
Bluetooth devices can be in 3 different power classes: Class 3 : The lowest power, the max. range of this is 10m (30 feet)Class 2 : Max range is about 50m (150ft)Class 1 : Max range is about 100m (300ft) ...
Bluetooth is faster than an ISDN connection but slower than a IR (infra red) connection used on a laptop - a normal Bluetooth connection is about the same speed as a home broadband connection.