R4 Smart Ring NFC Electronic Phone IOS Android Smartphone Wearable Magic Smart Ring Specifications: Carrier frequency: 13.56MHz, 125kHz RF distance: 1 ~ 3cm IC module type: UIDID Module type: T5577NFC Module type: Ntag213 Ring material: Ceramic Protection level: IP68 operating temperature range: -50℃ -80℃ Wearing diagram with the triangle facing outward. Module description: IC card module: Equivalent to a repeatable read-write IC card, supporting the stimulation of 13.56MHz M1 (Mifare1) IC card. ID card module: equivalent to an IC card that can be read and written repeatedly. It can read and write ID cards repeatedly and supports 125kHz ID card stimulation. Multifunctional APP (Note: Only supports mobile phones with NFC function, and android or Windows Phone systems) 1. Private instructions: 2. Mobile phone lock: 3. Quick start: 4. Sharing information: 5. ETC.. Other functions: None Requires batteries to be rechargeable, waterproof, dustproof, and drop-proof. Includes: 1 X Smart Ring 1 X Manual