Wireless Magnetic Door Sensor Alarm Chime Entry Alert Bell Business Entrance Kit Description[EXPAND WAVELINK FOSMON DOORBELL SYSTEMS] Perfect solution for expanding your Fosmon Doorbell System with this additional door sensor transmitter. Compatible with: 51004HOM -Fosmon WAVELINK Wireless Entry Alert Doorbell, 51005HOM - Fosmon WAVELINK Wireless Motion Doorbell Alert Sensor, 51007HOM - Fosmon WAVELINK Wireless Door Open Chime, 51009HOM - Fosmon WAVELINK Wireless Entry Alert Doorbell (Black)[MODERN AND CONTEMPORARY DESIGN] Never miss anyone at the door. The wireless and portable design works well in home, work, retail stores, salons, and business environments.[MAGNETIC DOOR SENSOR] With your Fosmon doorbell system installed, this magnetic door sensor activates when the magnetic stripe is separated notifying the receiver when the door has been opened.[BUILT-IN LED INDICATOR] The transmitter features an LED indicator that creates a visual alert for the hearing impaired.[EASY TO INSTALL] Wire free and easy to install. Each receiver can be paired with up to 10 transmitters. Each transmitter can be paired with up to 10 receivers.Expand Fosmon WaveLink Doorbell Systems Perfect solution for expanding your Fosmon Doorbell System with this additional door sensor transmitter.Compatible with: 51004HOM - Entry Alert Doorbell 51005HOM - Motion Doorbell Alert Sensor 51006HOM - Doorbell with Portable Flashing Vibrating Receiver 51007HOM - Door Open Chime 51008HOM - Doorbell 51009HOM - Entry Alert Doorbell (Black) 51018HOM - Door Open Chime Transmitter 51036HOMUS - Door Open Chime 51044HOMUS - Door Open Chime (Black) 51046HOMUS - Door Open ChimeMagnetic Door Sensor With your Fosmon WaveLink doorbell system installed, this magnetic door sensor activates when the magnetic stripe is separated. This transmits a signal to the plug-in portable receiver (not included) and alerts you with a ringtone every time the door is opened.Modern and Contemporary Design Never miss anyone at the door. The wireless and portable design works well in home, work, retail stores, salons, and business environments.Built-in LED Indicator The transmitter features an LED indicator that creates a visual alert for the hearing impaired.Easy to Install Wire free and easy to install.Versatility Each receiver can be paired with up to 10 transmitters, and each transmitter can be paired with up to 10 receivers.Specifications: • Maximum 400 feet or 120 meters operating range in open area• LED indicator• Transmitter Battery: 1.5V AA Alkaline Battery• Transmitter power consumption: