Fangrui Product Details Ad585 Is A Specially Designed Voltage Reference Module, It Uses Low-temperature Drift Components, Type C 5v Port As Power Supply, Uses Emi Filter To Make The Power Supply Purer And Smoother, No Need Battery To Supply Power. This Ad585 Voltage Reference Module Is Cheaper Than Ad584jn, But As Good As Ad584jn. Product Name: Ad585 Voltage Reference Module No-load Power Consumption: 45ma Power Supply: Type C 5v Port, 0.5a Power Supply Indication: Green Led Light Reference Voltage: 1.24v/2.5v/7.5v/5v/10v 5 Levels. Reference Resistance: 10/100/1k/10k/100k 5 Levels. Resistors Material: 0.metal Film Copper Feettcr:25ppm Working Environment: 16-30rh Product Usage: 1. Used To Verify The Accuracy And Linearity Of Handheld 3 1/2 Digital Multimeters. 2. Used To Verify The Accuracy And Linearity Of Handheld 4 1/2 Digital Multimeters, Must Keep The Same Temperature And Humidity As The Data Sheet Specified. Caution: 1. The Pull Switch Can Only Keep One On Each Time, No Two On Allowed At The Same Working Time