Haylou RS4 Max Calling Smart Watch

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Description reviews

Haylou RS4 Max Calling Smart Watch is a feature-rich smartwatch that offers a variety of useful functions, including Bluetooth calling, IP68 water resistance, 127 sports modes, and comprehensive health monitoring.

General Information

Product name: HAYLOU RS4 Max
Product model: HAYLOU RS4 Max
Main body size: 48.3*39*11.4mm
Watch weight (including strap) : 61.3g
Resolution: 320*380
Bluetooth connection: Bluetooth V5.3
Battery capacity: 270mAh
Input parameter: 5V 500mA
Battery life: 10 days (24 hours heart rate monitoring)
Dustproof and waterproof grade: IP68
Working temperature: –10℃~45℃
Data sync platform: Haylou Fun
Equipment requirements: Android 6.0 and above, iOS 9.0 and above

Technical Specification of Haylou RS4 Max Calling Smartwatch

Design

Body Material: Metal
Size: 48.3*39*11.4mm (mm)
Weight: 61.3g ( including strap)
Button: 1 side button
Strap Type: Magnetic silicon
Watch strap size: 22mm
Water-resistance Grade: IP68
Color: Midnight blue/Star silver

Display

Display Type: TFT HD display
Display Shape: Square
Display Size: 1.91’’
Display Resolution: 320*380 Pixel
Cloud-based watch faces: Yes

Battery

Battery Capacity: 270 mAh
Battery Life: In daily usage mode, the battery life can reach up to 9 days, and the standby time can reach up to 25 days.
Charging: Up to 2 hours
Charging type: Magnetic

Sensors & Connection

Sensor: Heart rate sensor, motion sensor, blood oxygen sensor
Connection : Bluetooth: v5.3
System requirements: Android 6.0 and above, iOS9.0 and above
Application: Haylou Fun
Package Contains: 1 device, 1 charging cable, 1 user manual, warranty card

Warranty Information

Warranty: 1 Year

Language:

English (default), Chinese, Traditional Chinese, Czech, German, Spanish, Arabic, Hindi, Indonesian, Italian, Thai, Polish, Portuguese, Russian, Vietnamese, Turkish, French.

Sports modes:

125+ sports modes: Outdoor walking, Race walking, Outdoor running, Marathon, Outdoor cycling, Unicycle, Hiking, BMX, Trail running, Roller skating, Trekking, Rock climbing, Surfing, Kayaking, Hunting, etc.

Download

Gladys Mwamburi

19-05-2026

This smartwatch is a steal for the price! The Bluetooth calling works crystal clear, and I love having 127 sports modes to track my workouts. The IP68 rating gives me peace of mind wearing it in the rain.
Prisca Lusungu

03-06-2026

Absolutely love my Haylou RS4 Max! The Bluetooth calling is crystal clear, and the IP68 rating means I never worry about water damage. Battery easily lasts over a week with all health tracking on.
Sharif Ndugu

03-06-2026

“The Haylou RS4 Max is an incredible value! Bluetooth calling works perfectly, and the IP68 rating means I never worry about water damage. Battery easily lasts over a week with all health tracking on.”