Features Efficient working: the 20KHz limit conversion frequency ensures high working efficiency, practical and reliable. Great Material Due to the use of high quality PCB material, the 4 channel signal converter is very durable for use. Extensive Usage Can be used for signal isolation, PLC signal level conversion, PNP to NPN conversion, etc. VOLT CONVERTER The optocoupler insulator can convert 24V to 5V, guaranteeing stable working performance. EASY TO INSTALL Lightweight and compact, the convenient installation is completed very quickly. Specification: Element Type: Optocoupler Insulation Board Material: PCB. Channels: 4 Conversion: 24 V to 5 V. Package list: 1 x optocoupler insulation board Package List 1 x Optocoupler Isolation Board