Fangrui Product Details For The Wifi Module A Adapter Module Of Esp-01. The 3.3v Voltage Regulator Circuit And Onboard Level Conversion Circuit Easy For 5v Microcontrollers To Be Used With Esp-01s Wi Fi Module. In Addition,the Product Can Be Used With For S Unor3 Or Compatible Board. Design: Compact And Robust Design, For And Long-lasting Use In All Types Of Environmental Conditions. Working Voltage: 4.5-5.5v (onboard 3.3v Regulator) Working Current: 0-240ma Interface Logic Voltage: 3.3v/5v Compatible (onboard Level Conversion Circuit) Due To Different Batches,there May Be Differences In Product Appearance And Printed Text,which Not Affect Use Colour:blue Material:pcb Package Contents: 10 Set X Wifi Wireless Adapter Module (10 Adapter Plates + 10 Eps01) Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.