Embodiments of the present invention are directed at gathering position information of mobile and stationary entities and using the position information in a wide variety of applications. The handle includes an elastic stop plate therein, which has an end fixed onto the handle and the other end tilted and extended towards a side of the blade. In addition, unintentional device orientation changes, such as periodic device orientation changes that might be caused by carrying the hand-held device while walking or driving, are filtered out dynamically. If the at least two sub-BMSs normally operate, the main BMS generates a synchronization signal and transfers the same to the sub-BMSs. A direct torque flow connection with optimized ratios in attachment methods is also provided.