Xiaomi Smart Doorbell 3S – Specifications
General
Product Name
Xiaomi Smart Doorbell 3S
Dimensions
146 × 52 × 29 mm (doorbell)
60 × 60 × 39.6 mm (chime – MJJSQ04-FJ)
Ingress Protection
IP65 dust & water resistance
Camera & Video
Resolution
2K (3MP) ultra-clear video, clearer than 1080p
Field of View
Diagonal 180° ultra-wide view, 107° vertical – “head to toe” framing
Night Vision
6 × 940 nm infrared LEDs, enhanced night vision with sensitivity adjustment
Image Enhancement
WDR support for clearer images in high-contrast scenes
Smart Features
Detection & Alerts
24/7 doorstep monitoring with PIR sensor + AI human shape detection, motion alerts to phone
Monitoring Area
Customizable monitoring zones to reduce unwanted notifications
Audio & Communication
Two-way voice calls, real-time remote monitoring, customizable auto-reply voice messages
Storage
Free rolling 72-hour cloud storage (no microSD card required)
Security
Xiaomi Security Chip, forced-removal alarm, device–account binding to prevent misuse
Connectivity & Power
Wireless Connectivity
Wi-Fi IEEE 802.11b/g/n 2.4GHz (Wi-Fi 6 compatible), RF 433MHz link to indoor chime
Power Supply
Built-in 5200mAh (typ) lithium battery + optional hardwired input 8–24VAC, 10–40VA; USB-C charging (5V⎓2A)
Indoor Chime
Dedicated RF indoor chime (MJJSQ04-FJ), multiple volume levels, Do Not Disturb mode
Operating Conditions
Doorbell: −20°C to 50°C, 10–90% RH (non-condensing)
Chime: 0°C to 45°C, 10–90% RH
