Main Features:<br />Onboard EL817 photoelectric coupler<br />Onboard 5V， 10A / 250V AC， 10A / 30V DC relays，<br />Module can be directly and MCU I / O link<br />Output signal indicator<br />Diode current protection<br />Working life: 100000 times in a row<br /><br /> Frequently Asked Questions:   <br />Q1. Why are these called Arduino Compatible? <br />A1. The Arduino group demanded us to remove their logos and rename these products so that they do not lead customers to believe they are the same units sold by Arduino<br />Q2. Are these 100 percent compatible with the normal Arduino's? <br />A2. Yes， they really are completely compatible with normal Arduino's. Build quality looks the same and everything (studio， library， tools， etc) just works<br /><br />    Specifications<br />General<br />	 Type: Relay module borad                                                  <br />                        Model: EL817                                                  <br />                        Material: Copper clad + Components                                                	<br />Weight and Size<br />	 Product Weight: 28 g                                                  <br />                        Package Weight: 0.09 kg                                                  <br />                        Product Size(L x W x H): 4.6 x 3.3 x 1.8 cm / 1.81 x 1.30 x 0.71 inches                                                  <br />                        Package Size(L x W x H): 20 x 14 x 3 cm                                                	<br />Package Contents<br />	 Package Contents: 1 x Relay Module                                                	<br /><br /><br /><br />                                                <br />