A barrel of a flashlight has a front barrel portion defining a front receiving
space, and a rear barrel portion connected to the front barrel portion and defining
a rear receiving space for receiving a battery unit. A lamp is disposed in a reflector
retained in the front receiving space of the front barrel portion. A conductor
unit is disposed in the barrel and establishes electrical connection between the
lamp and the battery unit. A coupling sleeve has a front coupling section formed
with an internally threaded surface for engaging an externally threaded mouth of
a light-transmissible bottle body of a plastic beverage bottle, a rear coupling
section mounted securely on the front barrel portion, and an intermediate section
interconnecting the front and rear coupling sections. A lens piece is mounted in
the intermediate section of the coupling sleeve.
