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First, look at the machine model behind the TV, and then find the appropriate device in the comparison table.
For example, the following figure, the string: L55E6700A-UD/RT95/TTP1401095
It means that the TV model is L55E6700A-UD and the movement is RT95.
Find the corresponding peripherals below, the camera supports Logitech: C170. Wireless mouse and keyboard support Pyramid: 8130, Logitech: MK260, Hyundai NK3000. 
TCL TV external mouse and keyboard camera adapter model summary
A lot of people reacted and did not know what kind of external equipment the TV supports. LZ tested a group of wireless mouse and keyboard sets and cameras for everyone. Hope to help everyone.