Abstract: A tiled display device includes two panels and two cover layers respectively disposed on the two panels. The two cover layers include a contact region. A top portion and a bottom portion of the contact region have a height H. One of the two cover layers has a thickness Tn. One of the two panels has a distance Xn between an upper surface of the one of the two panels and the bottom portion of the contact region. The one of the two panels is corresponding to the one of the two cover layers. The height H, the thickness Tn and the distance Xn satisfy the equation: 0<H/(Xn+Tn)<0.8.

Abstract: A method for controlling a derailleur in low battery remaining capacity includes determining whether a remaining capacity of a first battery of the derailleur is smaller than or equal to a first derailleur battery threshold. When the remaining capacity of the first battery is determined to be smaller than or equal to the first derailleur battery threshold, at least one of gear positions of the derailleur is invalided and non-selectable by the derailleur.

Abstract: A method for controlling a derailleur in low battery remaining capacity includes determining whether a remaining capacity of a first battery of the derailleur is smaller than or equal to a first derailleur battery threshold. When the remaining capacity of the first battery is determined to be smaller than or equal to the first derailleur battery threshold, at least one of gear positions of the derailleur is invalided and non-selectable by the derailleur.

Abstract: The disclosure provides a brake and shift control assembly configured to be mounted on a bicycle handlebar. The bicycle handlebar includes two handlebar parts and a middle part connected to and located between the two handlebar parts. The brake and shift control assembly includes a brake module and a shift control module. The brake module is configured to be mounted on one of the handlebar parts. The shift control module includes an assembly seat, a circuit board assembly, a battery, and an antenna. The assembly seat is configured to be disposed on an end of one of the handlebar parts away from the middle part. The circuit board assembly is disposed in the assembly seat, and the battery and the antenna are disposed on the circuit board assembly.

Abstract: The disclosure provides a brake and shift control assembly configured to be mounted on a bicycle handlebar. The bicycle handlebar includes two handlebar parts and a middle part connected to and located between the two handlebar parts. The brake and shift control assembly includes a brake module and a shift control module. The brake module is configured to be mounted on one of the handlebar parts. The shift control module includes an assembly seat, a circuit board assembly, a battery, and an antenna. The assembly seat is configured to be disposed on an end of one of the handlebar parts away from the middle part. The circuit board assembly is disposed in the assembly seat, and the battery and the antenna are disposed on the circuit board assembly.

Abstract: An armrests adjustment device for a chair is provided. The armrests adjustment device is to be assembled on a center column of a chair and installed with two armrests. The armrests adjustment device has a joint mechanism, two horizontal arms and two adjustment mechanisms. The joint mechanism forms a fixing hole configured to be disposed around the center column Each of the horizontal arms has a joint end and an adjustment end, the joint end is opposite to the adjustment end, and the joint end connects with the joint mechanism. One end of each of the adjustment mechanisms is mounted at the adjustment end of the horizontal arm, another end of each of the adjustment mechanisms is configured for being installed on one of the armrests.