Product Features: have the advantages of small size, light weight, long life, high reliability, good performance, and the power consumption is low, so you don't have to worry even if you work for a long time. IC chip contains: SN74LS00N, SN74LS02N, SN74LS04N, SN74LS08N, SN74LS32N, SN74LS47N, SN74LS86N, SN74LS90N, SN74LS138N, SN74LS245N SN74HC00N, SN74HC02N, SN74HC04N, SN74HC08N, SN74HC14N, SN74HC32N, SN74HC138N, SN74HC164N, SN74HC165N, SN74HC595N. There are 2 models for each model, a total of 40, The packaging is sorted accordingly in plastic storage boxes Including 5 pcs DIP14 socket, 5 pcs DIP16 socket. Function: NAND, NOR, Inverter, OR, Decoders/Demultiplexer. Wide Applications: suitable for automotive electronics, medical equipment, security monitoring, household Electrical appliances, student experiments and communication equipment.