Projection device

A projection device, comprising a casing, an operation module, a main board, and a conducting element, wherein

• the operation module comprises an operation element and an operation circuit board;
• the operation element is disposed on the casing to execute a first operation;
• and
• the operation circuit board is disposed in the casing and coupled to the operation element, and the operation circuit board comprises a wireless signal emitter and a first conducting portion, wherein an operation circuit on the operation circuit board is configured to generate a first operation signal in response to the first operation, and the wireless signal emitter is configured to emit the first operation signal;
• the main board is disposed in the casing, and the main board comprises a wireless signal receiver and a second conducting portion, wherein the wireless signal receiver is configured to receive the first operation signal, and a main circuit on the main board is configured to execute a first action corresponding to the first operation signal;
• and
• the conducting element is electrically connected to the first conducting portion and the second conducting portion.