Meanwhile, we investigated how the angle that the force was applied to the bistable metal strip, via the thread, impacted the magnitude of the trigger and reset forces. As shown in Figure 3, using the extended state of the bistable metal strip as a reference, we varied the angle of force application to trigger/reset the bistable metal strips. Three different angles were investigated for both the trigger and reset processes. As can be seen in Figure 6, larger trigger/reset angles led to smaller forces required for triggering and resetting. This could be explained from the force analyses of the process. When the angle of the applied force is large, the effective normal force, which is the projection of the vector force applied onto the tip of the metal, is likewise large. As a result, if the normal force required to trigger or reset the metal strip remains the same, larger angles lead to smaller vector force required. From the result, we concluded that we can minimize the force by maximizing the angle of force application approaching 90°. However, the angle was limited by the actual reasonable dimensions of the device. For our device design, considering the dimensional constraints and aesthetic aspects, we used 45° for triggering and 60° for resetting.