About these itemsRange and coverage: Offer long - range transmission, covering up to 656 ft / 200 m in open areas and 164 ft / 50 m through walls, ensuring comprehensive security for doors and windows.Customization: One model provides 58 customizable ringtones with 5 adjustable volume levels, while the other offers remote control via the Smart Life App for features like setting delays, timers, and customizing alerts.Installation: Both are easy to install with strong adhesive backing on doors, windows, or drawers. They require no tools and are designed for doors with gaps under 0.8 inches.Battery life: Feature long - lasting batteries, lasting over 1 year, reducing the need for frequent replacements.Versatile applications: Ideal for various security and monitoring needs, such as preventing break - ins, monitoring kids or the elderly, and alerting about customer arrivals.Key DifferencesItem Model Number: The two products have different model numbers, B9 and T9 - TY, which may indicate differences in features or design.Smart features: The T9 - TY model is a complete home smart alarm with Smart Life App control, Alexa Assistant support, and real - time notifications. The B9 model lacks these smart features.Number of sensors and additional components: The B9 model comes with 1 receiver and 2 sensors, while the T9 - TY model includes 1 receiver, 6 sensors, and 2 remote controls.Net weight: The B9 model has a net weight of 0.33 lbs / 0.15 kg, while the T9 - TY model weighs 0.70 lbs / 0.32 kg.SpecificationsB9Item Model Number: B9Door Sensor Voltage: DC12V 23AMaterial: ABSNet Weight: 0.33 lbs / 0.15 kgProduct Dimensions: 3.23 x 3.23 x 1.98 in / 82 x 82 x 50.4 mmT9 - TYItem Model Number: T9 - TYDoor Sensor Voltage: DC12V 23AMaterial: ABSNet Weight: 0.70 lbs / 0.32 kgProduct Dimensions: 3.23 x 3.23 x 1.98 in / 82 x 82 x 50.4 mmPackage ContentB91 x Receiver2 x Door Sensors A/B2 x Double - sided Adhesive A/B1 x User ManualT9 - TY1 x Receiver6 x Door Sensors A/B6 x Double - sided Adhesive A/B2 x Remote Controls1 x User Manual
