This purchase includes 3x Tapo T110 Contact Sensors and 1x Tapo H100 Smart Hub with Chime. Tapo enhances home security and convenience through its ecosystem of smart devices managed by the central Tapo Hub. Contact sensors placed on doors and windows allow users to remotely check their status via the Tapo app, eliminating uncertainty. The Hub utilizes an ultra-low power protocol, extending the battery life of connected sensors, switches, and buttons up to tenfold. For integrated security, opening a door or window can trigger paired Tapo pan/tilt cameras to track movement and sound an alarm on the Hub, while real-time app notifications and an activity log provide immediate awareness and review capabilities. Furthermore, these sensors can be paired with smart lighting for automated illumination in designated areas. Installation is effortless with magnetic and adhesive mounting options, and the sensors' compact size ensures discreet placement throughout the home. Each Tapo contact sensor is measured as 2.42 x 1.48 x 0.48 inches. The Tapo Smart Hub is measured as 2.8 x 2.5 x 2 inches.