There is one controller with one weight sensors which room escape owners can installed in desk or wooden board, players have to figure out the puzzle and find out the target weight, and put the right object/wanted weight on the weight sensor. If the scale sensor has been place the right weight, the door will open.PACKING LIST1 x Controller1 x 12V Power Adaptern x Weight Sensors Set (n:1-12)NOTES1. Props do NOT include EM locks, please provide 12v EM lock by yourself.2. The object on the weight sensor is Not included, just for description.3. The maximum sensing weight is 8KG, DO NOT overweight during using, or the scale sensor may be damage.HOW TO RESET? There are 2 ways to reset the props: 1. All wanted objects away from the sensors to reset.2. Restart the controller to reset.HOW TO REVISE THE TRIGGER WEIGHT ?1) Keep clear on the scale sensor.2) Power on the controller. 3) Put an object/wanted weight(The maximum sensing weight is 8KG) on the weight sensor for a password.4) Press the black button which is in the small black box connection to the weight sensor (First you need to open the small black box), there will be a voice prompt “the door is open”, then the password is set successfully.5) Power again to test.HOW TO MODIFY THE VOICE FILES?1) Back up the original files in the memory card.2) Replace the original file with your favorite sound file, The path and the file name can not be changed, the audio file format must be in MP3 format.