Size:8(57.1mm)  |  Colour:Black Jakcom R3F Smart NFC Multifunctional Ring Compatible with Android and Windows mobile phones. All the Android and WP mobile phones with NFC function can normally apply it. Our Smart ring only supports the Android and Windows mobile phones with NFC function.The smart magic ring is a wearable gadgets components, runs magic functions on mobile phone, and operate the mobile function and share the data by NFC wireless frequency communication technology.-Smart Ring Functions- Private Note- Mobile Phone Lock- Quick Start- Whisper- Magic business card- Link sharing- Network disk sharing- The key of Intelligent door- Screen unlockSmart Ring Details- Epoxy Crystal Ceramic- Two High Speed NFC Dual-core Chips- IP68 professional standard: Dustproof/waterproof/anti-fall- Real jewelry-level dimension: Thickness only 1.8mm- Thickness only 7.9mmSize measurementVarious sizes are available.1. In measurement, it is better to wind the finger to be worn with a fine rope or thread (non-flexible).2. Try to tighten the rope lest the size is too large for the finger. It is better to keep the error within 1mm.3. Straighten the rope and measure the length with ruler.
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