This little module is powered with 3V and projects a very bright, red dot pretty much wherever you point it.
If only it had that 'Beware of Laser Radiation' sticker on it...

Light power: <5mW
Transmit power: 58nm
Voltage: 3V DC
Operating Current: <40mA
Operating temperature: -36 ~ 65
Storage temperature: -36 ~ 65
Spot size: 15 meters spot for f10 mm ~ f15
Size: 6.5*15mm (including circuit board)

Single weight: 2.5 grams
Power lead length: 95mm
Housing material: Brass
Focusing (no glue)
Cable length: 4 cm
Blue cable: V +
Red cable:V -