Abstract: An adjustable clamp structure includes a first clamp member comprising a first clamping portion and a first fixing portion formed on one end of the first clamping portion, a second clamp member comprising a second clamping portion and a second fixing portion formed on one end of the second clamping portion; and an adjustment member disposed between the first clamp member and the second clamp member. The adjustment member has an adjusting portion and a pivot portion that are movably combined. The adjusting portion is disposed on another end of the first clamping portion, and the pivot portion disposed on another end of the second clamping portion. The first and second clamp members are combined through the adjustment member and form a clamp distance therein. The second clamp member is movably adjusted with respect to the first clamp member for clamping the tubes with different diameters.

Abstract: A light emitting device controlled by placement angle thereof includes a housing space disposed inside a shell element, wherein a light emitting element, a power supply element, and a conductive element are disposed in the housing space. The conductive element has a passage having a conductor therein. By a tilt of the shell element, a placement angle thereof is changed, whereby the conductor moves inside the passage between a conducting position and a disconnecting position. The wire set between the light emitting element and the power supply element is conductive when the conductor is at the conducting position, and is not conductive when the conductor is at the disconnecting position. Thus, the light emitting element is able to be controlled by changing the placement angle of an object to which the light emitting device attached, thereby achieving the convenience for usage.