Use DACK for contactless check-in, mobile room-access, property guides, and more. - Contact-free check-in: With the DACK app guests can go straight to their room, home, or apartment without having to meet anyone at a front desk or rental office. Through the app guests can check-in and utilize a mobile key or key codes for access. - Property guide: With the DACK app guests can learn more about their accommodations amenities, surrounding attractions, stay instructions, and more.