HK12 Ultra 4 Smart Watch

The HK12 Ultra 4 is a 49mm Apple Watch Ultra 4 - Inspired Budget Smart Watch  Running on The RTOS  Operating System via the ( Wearfit Pro App ) . It stands out for its standalone WhatsApp Companion App Integration and on-board local storage.

Hardware & Display 

• Processor: SF32LB525 dual-core chipset
• Display: 2.02-inch flat Super AMOLED screen
• Resolution: 410 × 494 pixels
• Build Material: Zinc alloy metallic chassis with a 49mm form factor
• Dimensions: 49.3mm x 43.4mm x 14.5mm
• Physical Controls: Rotating crown key, side function button, and custom orange action button
• Storage: 1GB local memory (supports local music playback, voice recording, e-books, and photo albums)
• Water Resistance: Rated IP67 (resistant to daily splashes, rain, and hand washing)

• Bluetooth: Version 5.1 / 5.3 (supports Bluetooth calling directly from the wrist and direct TWS earbud pairing)
• WhatsApp Integration: Features a native WhatsApp application that links via QR code. It supports reading recent messages and replying using voice-to-text, quick replies, or emojis (Note: cannot load incoming images or play voice notes).
• AI Capabilities: Integrated ChatGPT AI assistant and voice interaction.
• NFC: On-board NFC chip primarily used for contactless access control and smart locks.
• Customization: Always-on Display (AOD) with 6 selectable pointer styles. Supports custom watch face uploads and AI-generated watch faces.
• App Ecosystem: Features an on-device online app, utility, and game marketplace.

• Sensors: Optical heart rate tracker, blood oxygen (SpO2) monitor, blood pressure estimator, and a hardware compass.
• Activity: Pedometer (step tracking), calorie burning data, and over 100 dedicated sports tracking modes.
• Lifestyle: Sleep monitoring, sedentary alerts, and female health assistance tracking.

• Battery Capacity: 260mAh lithium battery 
• Battery Life:
  • 3 to 4 days with Always-On Display (AOD) active.
  • 5 to 7 days under standard/typical daily use. 
• Charging: Wireless charging via an included circular magnetic pad cable.

• OS Compatibility: Android 4.4+ and Apple iOS 8.0+ via the Wearfit Pro companion application.
• Language Support: Multi-language interface supporting 22 languages including English, Arabic, French, German, Spanish, and Chinese.