Made of fine ceramics, this multi-function ring features strength, toughness hardness that is just slightly weaker than diamonds. It is compatible with all Android phones to function screen unlock, profile exchange and door access. Coming with a wider top and narrower bottom, this ergonomically designed ring ensures comfortable wearing.

• Material: Zirconia ceramics (ZrO2).
• Glossy finish with swirling patterns.
• Rugged construction with high strength, toughness and hardness.
• Minimize signal and antenna interference for better connection and accurate reaction.
• Excellent wear resistance and chemical resistance.
• Function as screen unlock, profile exchange and door access with corresponding applications and systems. 
• NFC meets ISO/IEC 14443-3.
• Compatible with all Android phones with NFC function.
• Frequency: 13.56MHz.
• Antenna working range: within 1 cm.
• Waterproof class: IP68 certified, submerged in 30 meters of water up to one hour.
• Dustproof class: IP68 certified, completely dust-proof.