YoLink YS7704 Door & Window Sensor, 3-Pack

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Product guide

YoLink YS7704 Door & Window Sensor, 3-Pack

The YoLink YS7704 Door & Window Sensor 3-pack is a battery-powered wireless contact-sensing kit for monitoring doors and windows. It uses LoRa and can be used with a hub for full functionality, or paired directly with a compatible siren for a more limited standalone setup.

At a glance

Three sensors are supplied without a hub, according to the listing's selected configuration.
The listing describes app alerts and a door-left-open reminder, with a hub required for full functionality.
Device-to-device pairing with a siren is offered as a hub-free option, but requires compatible additional devices.
The manufacturer claims up to a quarter-mile open-air LoRa range. Actual placement and conditions may affect reach.

Price

$40.79Save 15%

Reference price: ~~$47.99~~

Price checked: Nov 14, 2026

View offer Ahead of Black FridayExplore the selection

Often bought together

YoLink SpeakerHub Smart Home Hub with Voice Alerts, YS1604 | Hear Custom Sensor Alerts, Alarm Tones, Works with Home Assistant, LoRa YoLink Protocol Up to 2034 Feet, Wi-Fi Required

$26.99

YoLink Indoor Motion Sensor, YS7804 | Motion-Triggered App Alerts, Smart Routines, Works with Home Assistant, LoRa YoLink Protocol Up to 2034 Feet, Hub Required

$21.59

Pros and cons

Pros

A three-sensor set can cover several doors or windows without buying sensors individually.
Mounting tape is listed for installation, and the manufacturer describes QR-code setup.
The claimed battery life of 2 years may reduce routine battery changes.
Direct sensor-to-siren pairing is described for certain actions even when internet service or power is down.

Cons

Full functionality requires a hub and an internet connection, so this no-hub pack alone does not provide the complete connected setup.

Technical specifications

15 specifications

Identity
Brand	YoLink
Model	YS7704-UC*3
Pack configuration	3-pack without hub

Sensor and connectivity
Sensor technology	LoRa
Wireless connection listed	Wireless
Control methods listed	App
Alert type listed	Motion
Maximum range	2034 feet
Compatible device	Smartphone

Power and battery
Power configuration	Battery Powered
Battery type	Alkaline
Battery life listed	2 years
Voltage	3 volts

Installation and weight
Installation method	Mounting Tape
Weight listed	66 g

What to know before buying

Listing details to confirm

The listing's Alert Type field says “Motion,” while its product description presents the devices as door and window contact sensors. It also gives a 2034-foot maximum range while describing a quarter-mile open-air range. The headline identifies a three-pack without a hub, while the built-in-media list includes a siren and the description discusses separately paired sirens. Confirm the sensor alert behavior, applicable range conditions and selected package contents before buying. The stated 2-year battery life differs from the description's claim of 2+ years standby.

Who is it for?

A good fit for

People who want several battery-powered sensors for doors, windows or other openings and are prepared to configure a compatible hub or siren.
Buyers looking for a LoRa-based sensor system for locations where they want to try a longer-range connection than Wi-Fi.

Less suited to

Anyone seeking a complete hub-based smart-home setup in the box, since the selected listing says without hub.
Buyers who need a standalone audible alarm from the sensors without adding a compatible siren or hub.

YoLink YS7704 Door & Window Sensor, 3-Pack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 3,267 ratings

5 stars78%78%
4 stars11%11%
3 stars4%4%
2 stars2%2%
1 star5%5%

Customer feedback highlights easy setup, useful alerts and smart-home connectivity, including mentions of Alexa, Home Assistant and IFTTT. Customers also report notifications arriving within seconds and describe the system as versatile. These are reported experiences, not guaranteed behavior. For buyers considering this LoRa sensor kit, the positive feedback is relevant to everyday monitoring, while the reported reach is distinct from the listing's much higher open-air maximum and does not settle performance at a particular site.

Positive themes

Customers describe installation as easy and report quick setup.
Feedback mentions useful opening notifications and smart-home integrations.
Customers report positive experiences with versatility and value.

Frequently asked questions

Does this three-pack include a hub?

The selected configuration is described as a three-pack without a hub. The listing says a hub with an internet connection is required for full functionality.

Can the sensors work without a hub?

The manufacturer describes direct device-to-device pairing with a compatible siren as a limited alternative. That setup requires a separately obtained compatible device.

What battery life does the listing claim?

The specifications list 2 years. The description separately claims 2+ years of standby, so treat battery life as an estimate rather than a guaranteed duration.

Are batteries included?

The product description claims six AA batteries are included and preinstalled. The selected configuration and package list should be checked, because the listing also has conflicting kit details.