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Four small white rectangular sensors with wall-mount brackets

Emerson HMS-04 Smart Sensor 4 Pack 128° 6m

SKU CH-YJDP-FN82H MPN HMS-04

A four-pack of battery-powered motion sensors covering 128° and six metres with Alexa and Google Assistant voice control

  • Connection protocolWireless
  • Details8 L x 2 W x 1.5 H centimeters, 0.08 lb, 6 m, Wall Mount, Bat
  • Key featuresWall Mount, 6 m, false
  • Product dimensions14.33 in W × 12.83 in H × 9.06 in D
  • Product weight0.08 lb (0.04 kg)
  • Monitor home security from anywhere via Smart Life or Tuya app
  • Get instant push alerts when motion is detected up to 6 metres away
  • Trigger Alexa or Google Assistant routines with voice commands
  • Automate lights or plugs to switch on when movement is sensed
  • Compact battery-powered design mounts on any wall for flexible placement

Four-Pack Motion Sensors for Whole-Home Coverage

The Emerson HMS-04 kit supplies four wireless motion detectors for indoor security and automation. Each unit runs on two included AAA batteries and mounts on a wall without wiring. The sensors suit homeowners who want room-by-room awareness and app-driven routines across multiple zones.

Check App Compatibility

Verify that your phone runs the Smart Life or Tuya Smart application for set-up and alerts. Ensure each intended location offers a clear line of sight within the 128° field of view and 6 metres range. Confirm the wall surface can hold the supplied mount and that the sensor height suits the desired detection pattern.

Battery Operation Keeps Heat and Noise Negligible

Passive infrared sensing draws minimal current, so the devices stay cool and silent during normal use. Two alkaline AAA cells power each sensor, eliminating mains wiring and standby consumption. Expect long intervals between battery changes thanks to the low-power wireless protocol.

How it compares

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

Price $59.99
Pricier than about 81% of the 180 comparable items (median $30.99).

Specifications

Product
Brand nameEmerson
Model nameHMS-04
Part numberHMS-04
Connectivity
Connection protocolWireless
Size & build
Product dimensions14.33 in W × 12.83 in H × 9.06 in D
Product weight0.08 lb (0.04 kg)

Questions about this item

What comes in the box and do I need to buy batteries separately?

The box contains four HMS-04 motion sensors and eight AAA alkaline batteries are included so no separate purchase is needed.

Should I choose a different pack size or detection range for larger rooms?

Only the 4-pack with 128° detection and 6-metre range is offered; there is no alternative capacity or angle listed.

What does the 128° detection angle mean when the sensor is mounted on a wall?

It gives a wide field of view up to 6 metres so a single unit can monitor a large hallway or living-room entrance from one mounting point.

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