Review on Wireless Doorbell, PHYSEN Waterproof Door Bell Chime Kit Operating At 1300-Ft Range 58 Adjustable Melodies 5 Volume Levels & LED Flash, Doorbell Alarm For Home/Classroom, 2 Push Buttons+4 Receivers by John Clarey

I recently purchased 4 Physen receivers and 3 different types of Physenwireless transmitter (motion detector, window/door sensor, push button).All are used in a two-story house within a range of approximately 100 ft.All devices work as advertised.Each receiver has 4 different volume levels (none totally silent) and lightsup when activated. Each receiver offers some 52 different ring tones(bells, chimes, melodies). Each ring tone can be sampled on YouTube. Simplysearch for "Physen CW Door Bell Ringtones". The only way to select aspecific ring tone is to cycle through them, looking for the sound desired.This is a bit awkward. A nice feature would be a number system permittingeach ring tone to be located directly using a unique number.Each transmitter can easily be programmed to play one of the ring toneson one or more of the receivers. Each receiver can be set to play adifferent ring tone based on the signal received from a specific transmitter.Overall, this product is readily extensible, since each type of transmitterworks with each receiver. This is a very helpful feature.