Abstract: A display device includes an inflatable frame which is connected to an inlet valve and an outlet valve so as to inflate the frame within a short period of time. A plurality of and fixtures are connected to the inflatable frame so as to position the inflatable frame. A base board is enclosed by the inflatable frame and a plurality of support members are connected to the base board so as to position light bulbs. A display sheet is sandwiched between the base board and a transparent protection board.

Abstract: A portable ozone generating device includes a base with an integrated circuit board, a first switch member and a second switch member respectively received therein. A set of battery is received in the base and electrically connected to the circuit board. A pivotable member is pivotally connected to the base and a ultra-violet bulb is engaged in the pivotable member. A first control member and a second control member are respectively connected to the pivotable member, and are activated to light up the ultra-violet bulb and the electric shock device on a top of the base when pivoting the pivotable member away from the base at different angles.

Abstract: An air curtain generator includes a casing with a fan received therein so as to blow an air curtain from opening of the casing. Two arms are pivotally connected to two end members on two ends of the casing. and each arm is pivotally connected to a fixed member. A link is pivotally connected between the fixed member and the end member so that the casing is able to be adjusted by pivoting the arms. The air curtain separates the workers and the source where generates contaminated air.