Main Features:<br />With built-in 3.3~5V switching circuit<br />With protective IC and normally open / closed contact<br />Strong drive force with 4-CH 250V 10A<br />With LED indicator<br />Supports cascade connection<br />With built-in 3.3V stabivolt output<br />With bluetooth serial port and RF serial port to choose from to control PC or cellphone wirelessly<br /><br /><br /> Instructions: <br />FF 01 00 01 EE: 1st channel close <br />FF 01 01 02 EE: 1st channel open <br />FF 01 02 03 EE: 1st channel 1s inching<br />FF 02 00 02 EE: 2st channel close <br />FF 02 01 03 EE: 2st channel open  <br />FF 02 02 04 EE: 2st channel 1s inching <br />FF 03 00 03 EE: 3st channel close <br />FF 03 01 04 EE: 3st channel open <br />FF 03 02 05 EE: 3st channel 1s inching<br />FF 04 00 04 EE: 4st channel close <br />FF 04 01 05 EE: 4st channel open <br />FF 04 02 06 EE: 4st channel 1s inching<br />FF 25 00 25 EE: all close <br />FF 25 01 26 EE: all open<br /><br />    Specifications<br />General<br />  Type: Relay module borad                                                 <br />Weight and Size<br />  Product Weight: 0.097 kg                                                  <br />                        Package Weight: 0.150 kg                                                  <br />                        Product Size(L x W x H): 6.6 x 6.5 x 1.8 cm / 3.2 x 1.9 x 0.7 inches                                                  <br />                        Package Size(L x W x H): 8.0.0 x 8.0 x 3.0 cm                                                 <br />Package Contents<br />  Package Contents: 1 x Module (19cm Wire)                                                 <br /><br /><br /><br />                                                <br />