The NEC remote decoder board is based on the IC ST3679 which decodes the received remote control data and output 16 bit serial data output. The decoded data contains various information like Repeat Command, Address of Remote and Command Key Pressed. This decoded information from transmitter can be used in various ways to make any remote controlled application.
The transmitter should be a NEC protocol type normally found in house hold remote controls. Most TV, DVD, AC remotes are either RC5 type or NEC type. Remote of these labels NEC, APEX, HITACHI, PIONEER uses NEC protocol.