Bottle Light does not need any external                           power supply to make it work. The user has                           to simply replace the original bottle cap with                           the Bottle Light and compress the air in the                           bottle repeatedly to make the piston of Bottle                           Light move up and down. This action changes                           mechanical energy into electric energy, which                           lights the LED on the bottle cap. Extra electric                           energy generated by the movement is stored                           in the battery. Bottle Light is small and handy,                           and it can be put in the pocket or worn as an                           ornament when not being used. When light is                           required, the user can simply pick up a bottle                           and screw Bottle Light on. 
                         
Bottle Light has two illumination modes, which are operated using the "up" and "down" switches on the cap. When the "up" mode is switched on,the LED at the top of the cap is lit and Bottle Light can be used as ahand-held torch. When the "down" mode is switched on, the LED at thebottom is lit. It lights up the whole bottle, which allows Bottle Lightto be used as a flood lamp. Different colours can be made available.Bottle Light can be used to add atmosphere to special event such asparties. It can also be used as a signal lamp.
Source: red-dot.sgAdded: 27 January 2009