Greencycle KS-SF20R Motion Sensor Door Chime
- Maximum Range: 8 meters
- Power Source: Battery
- Mounting Type: Wall Mount
- Item Weight: 0.44 pounds
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
Useful where a motion trigger beats a doorbell button, with enough ringtones and modes to cover a shop, a nursery or a caregiving setup, so long as it stays indoors or under cover.
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ASIN: B078PKYRS7Model: KS-SF20RCategory: Doorbell Chimes
Overview
This wireless chime doubles as a motion-sensor alert for shop entrances and caregiving, switching between welcome greetings, a doorbell tone, a security alarm and a silent color-light mode. It picks up motion from 2 to 8 meters and pairs one receiver with up to 32 sensors.
Sold as a store entry alert as much as a doorbell, the motion sensor triggers on anyone walking through a doorway rather than waiting for a button press, which also suits checking on an elderly relative or a sleeping baby via the silent lighting mode. The receiver differentiates senders by lamp color, red, green or blue, rather than a distinct sound per sensor, worth knowing before wiring up multiple doors. It runs off USB power or 3 AAA (sensor) and 3 AA (receiver) batteries, and the seller notes it is not waterproof.
- 5 modes: welcome, doorbell, alarm, color light, lighting
- 36 ringtones, 5 welcome languages
- Up to 280m/918ft wireless range, 2-8m detection range
- Expands to 32 sensors and 8 remotes per receiver
Who it's for
Small business owners who want to know when a customer walks in without a button to press, and anyone monitoring a bedroom or exterior door for an elderly or hearing-impaired household member. Not for exposed outdoor doors, since the sensor is not waterproof.
Pros and cons
- Motion trigger needs no button press
- 5 modes cover doorbell, welcome, alarm and silent light use
- Expandable to 32 sensors and 8 remotes per receiver
- Runs on USB power or batteries
- Not waterproof, indoor use only
- Colored light, not a unique chime, identifies which sensor fired
Performance notes
The infrared sensor fires on movement roughly 2 to 8 meters (7 to 26 feet) in front of it and sends a wireless signal to the receiver, rated for up to 280 meters (918 feet) in open space; the receiver then plays one of 36 ringtones, a welcome phrase in one of five languages, or an alarm tone, or simply lights up in the chosen color at the set brightness.
Specifications
| Brand | greencycle |
|---|---|
| Model | KS-SF20R |
| Dimensions & fit | |
| Item Weight | 0.44 pounds |
| Item Dimensions D X W X H | 0.8 × 1.6 × 2.4 inches |
| Capacity & performance | |
| Maximum Range | 8 meters |
| Power & efficiency | |
| Power Source | Battery |
| Construction & materials | |
| Color | Motion Sensor Doorbell |
| Compatibility & installation | |
| Mounting Type | Wall Mount |
| Compatible Devices | Motion Sensor, Remote Control |
| Other details | |
| Frequency | 433.92 MHz |
| Number Of Batteries | 1 AAA batteries required. |
| Number Of Items | 1 |
| Mfr Part Number | M-CA-KS-SF20R-1PK |
| Builtin Media | 1* Infrared Sensor, 1* Receiver |
| Item Highlight | Store Door Entry Bell, Commercial Door Entry Alert, Motion Sensor Detect Alarm, Caregiver Reminder For Elderly, Visitor Bell |
| Antenna Location | Driveway, Garage, Garden, Lawn, Sidewalk, Terrace, Walkway |
Frequently asked questions
Can the Greencycle sensor tell me which door was triggered if I install several?
Yes, but only by light color, red, green or blue, not by a unique chime sound per sensor.
Is the Greencycle motion sensor doorbell waterproof?
No, the listing states it is not waterproof, so it's meant for indoor use.
How does it power on?
Either through a USB port or on batteries, 3 AAA cells in the sensor and 3 AA cells in the receiver.