simple, works great, seamless and fast, from open box to fully operational; many optional chimes, easy to change; this was for an add-on to 2 transmitter, 2 receivers I had purchased a couple of days before, and the add on was just as seamless as were the 2 transmitters and 2 receivers --STARPOINT Expandable Wireless Multi-Unit Long Range Doorbell Chime Alert System, Base Starter Kit includes 2 Plugin Receivers & 2 Remote Button Transmitter, Model LCBase, White
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