We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
White wireless motion sensor and receiver set, wall mount, battery powered

Emerson KS-SF20R Smart Sensor White Wireless 8m Range 36 Ringtones 280m 918ft 32 Sensors

SKU CH-GSXX-TJZDX MPN KS-SF20R

Wireless motion sensor kit with 8 m detection, 280 m range, 36 ringtones and expandable to 32 sensors

  • Connection protocolWireless
  • Product colorWhite
  • Product typeClock
  • Details0.79 L x 1.57 W x 2.36 H inches, 0.2 kg, 8 m, Wall Mount, Ba
  • Key features1* Receiver, 1* Infrared Sensor, Wall Mount, 8 m, false
  • Product dimensions14.33 in W × 12.83 in H × 9.06 in D
  • Five operating modes cover welcome, doorbell, alarm, colour light and lighting needs
  • 36 ringtones plus five welcome languages with four volume levels up to 113 dB
  • Wireless link reaches 280 m or 918 ft between sensor and receiver
  • Infrared sensor detects motion across 2 to 8 m or 7 to 26 ft
  • System expands to 32 sensors and eight remotes per receiver with colour-coded alerts

Motion-sensor doorbell kit

The Emerson KS-SF20R is a wireless motion-sensor doorbell kit designed for indoor use. It includes one receiver and one infrared sensor that detects movement up to 8 meters away. The system operates on AAA alkaline batteries and mounts on a wall. It suits homes, small businesses or care settings that need an audible or visual alert when someone approaches a doorway.

Who it suits and who it does not

The kit works well for shop owners who want a door chime, caregivers monitoring elderly relatives or households with hearing-impaired occupants who benefit from adjustable-volume tones and coloured LED indicators. It is not suited for outdoor installation because the hardware is not waterproof. Buyers who need multiple distinct chimes per sensor should also look elsewhere, as the receiver uses only coloured lights to differentiate up to 32 sensors.

Wireless range and expandability

The receiver communicates with sensors at up to 280 metres (918 feet) in open space, which determines whether the kit covers the required distance between entrance and monitoring point. Each receiver supports a maximum of 32 motion sensors and eight remote controls, so the total number of entry points you plan to monitor decides if one kit is sufficient.

How it compares

Measured against everything we stock in Alarm Kits & Motion Sensors, at today’s prices. Recalculated every night.

Price $51.99
Pricier than about 76% of the 180 comparable items (median $30.99).

Specifications

Product
Brand nameEmerson
Model nameKS-SF20R
Part numberKS-SF20R
Product colorWhite
Product typeClock
Connectivity
Connection protocolWireless
Size & build
Product dimensions14.33 in W × 12.83 in H × 9.06 in D
Product weight0.2 kg
In the box
In the box1* Receiver, 1* Infrared Sensor

Questions about this item

What are the exact dimensions of the receiver so I can check if it fits my wall space?

The receiver measures 14.33 inches wide by 12.83 inches high by 9.06 inches deep, weighing 0.2 kilograms.

How do I pair the infrared sensor with the receiver, and what is the common mistake to avoid?

Press the learning button on the receiver, then trigger the sensor within range; the common error is mounting the sensor beyond the 8-meter detection zone before pairing is confirmed.

Which batteries will I need to replace later, and how many?

The system runs on AAA alkaline batteries for both the receiver and the infrared sensor; expect to replace two sets over time.

More in Alarm Kits & Motion Sensors

Similar items