Logitech exhibited its laser wireless mouse "MX Air" which can be flexibly used both in the air and on the desk at the Electronical Exhibition in Berlin, Germany. Selection is done via ray.
It seems that this device can only be applied in meetings and lectures etc. Although it is quite novel, it is very tiring to use. If you hold this thing for a whole day, your nerves will probably endure it, but your arms will rebel first.