Check the listing for details. STI Wireless Doorbell Extender with Receiver Kit (STI-3300). Color: N/A, Condition: New. Listed at 51.19 USD. Hear your doorbell chime at an additional location in your home by setting up the STI Wireless Doorbell Extender with Receiver. This complete DIY kit comes with a wireless receiver that plugs into an outlet up to 500 feet away from your existing doorbell chime to alert you when the button is pressed.Provides doorbell chimes for an additional locationWorks with an existing hardwired doorbell systemExtender triggers alert at receiver when doorbell button is pressedWireless range up to 500 feet between unitsPlug-in receiver supports up to 10 sensors totalHow It Works The included "Wireless Doorbell Extender" wires into your existing hardwired doorbell chime. When the existing chime receives a signal from your doorbell button, the extender also triggers and sends a wireless signal to the plug-in receiver. The receiver then alerts you by chiming. Your existing doorbell will continue to chime as well. The receiver emits 2 different alert sounds, Ding, and Ding Dong, allowing you to identify alerts from different transmitters (sold separately) in your system. Expandable System As part of the STI Wireless Chime Series, the included receiver can be used to monitor up to 10 wireless transmitters total (sold separately). Available add-on transmitters include door sensors, extra doorbell buttons, and more.ContentsWireless Doorbell Extender (STI-3331)Wireless Chime Receiver (STI-3353) Note: Requires a hardwired doorbell to operate. May not work properly with door chimes that play melodies or use batteries.Product Features 2 Selectable SoundsDingDing-DongTechnical DetailsManufacturer Part #: STI-3300UPC: 662950002765Frequency: 433 MHzWireless Range: Up to 500 feet (line of sight)Power Source: Receiver plugs into 120 VAC outlet (minimum 110 VAC)Dimensions:Transmitter: 3.15(L) x 1.5(W) x 0.85(D) inchesReceiver: 5.0(L) x 3.25(W) x 1.425(D) inchesApprovals: UL, cUL, FCC, ICWarranty: 1-Year Limited