Add ESP-01S module. This smart relay module is based on the ESP-01S WIFI module design. It can be used to DIY your own smart switch. It can be remotely controlled by the mobile phone APP and provides APP and LUA source programs. It's easy to usegood simple and convenient. Module working voltage: DC 5V Relay load capacity: 10A 250VAC 10A 125VAC 10A 30VDC 10A 28VDC colour: blue-black Material: PCB Size: 37.2x25.2mm Package Contents: 1 x Relay module Only the above package contentgood other products are not included. Note: Light 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. About Us We provide the good product with the best pricegoodwe support Wholesale/Drop Shipping Order 1. For Drop Shipping ordergood please remark"dropshipping order"good we will prioritize it. 2. For Wholesale/Drop Shipping ordersgood if you have any ideas about the price or packagegoodplease contact us in advancegoodwe will give you the best service to satisfy your demands. About Shipments 1.We will send out the orders ASAP once your payment is completed normally. 2.Please write your complete delivery address with correct phone number and zip codegood especially please confirm your full name. About After-sale Service We are reliable seller and we have our professional after-sale service for all of our customers. If there is any question about the ordergoodplease contact us in advance goodwe will always here until you get a happy answer. About Feedback 1. Please check the package and item when you get carefully to make sure there is no problem. 2. If you have any problem or are not entirely satisfied with your packagegoodplease don’t be hesitate to contact us first before leaving negative feedback. We will resolve the problem to satisfy you. 3. If there is no problemgood please leave us five star positive feedback. Your affirmation is our greatest motivation ! ! !