Qeacher let your guests or visitors (like postman etc.) reach you through QR Code ordered from Qeacher and sticked or hanged front of your door. Besides you can use Qeacher as video doorbell, or like you can use Qeacher Digital QR Code for your visitcard, Qeacher Sticker for stick to your car or surfaces (front of your shop, office room etc.) that you want your guest to reach you.