... Learning code receiver module 2. 4 channles output 3. Strong noise immunity Operation voltageDC 2.4-5.5VStandby current<1uAOperation frequency315MHz, ... (Typ.)EncoderLearning code, 1527, ITCStudied Remotes Quanity5pcs(Max.)Output channel4 channels (D0-D3)Output ModeLocked / Memontary (optional)AntennaExternalPackageDIP, 7pin, ( ... working with you! 433M Learning code receiver module with 4 channels