Brake and shift control assembly

A brake and shift control assembly, configured to be mounted on a bicycle handlebar, the bicycle handlebar comprising two handlebar parts and a middle part connected to and located between the two handlebar parts, and the brake and shift control assembly comprising:

• a brake module configured to be mounted on one of the handlebar parts;
• and
• a shift control module comprising an assembly seat, a circuit board assembly, a battery, and an antenna, wherein 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;
• wherein when the assembly seat is disposed on the end of one of the handlebar parts away from the middle part, the antenna is located outside the bicycle handlebar;
• wherein the assembly seat comprises a bottom portion and a sidewall portion connected to each other, the sidewall portion surrounds the bottom portion, the bottom portion and the sidewall portion together form an accommodation hole therebetween, the end of one of the handlebar parts is inserted into the accommodation hole and is in contact with the sidewall portion, and the circuit board assembly is located in the accommodation hole;
• wherein the circuit board assembly comprises a first circuit board and a second circuit board, the first circuit board is electrically connected to the second circuit board, the first circuit board is disposed on the bottom portion, the second circuit board is disposed on the sidewall portion, the battery is disposed on the first circuit board, and the antenna is disposed on the second circuit board.