Product model: B16 Black Technology Smart Bracelet Charging mode: magnet automatic adsorption Master MCU: Bluetooth 5.1 Black Technology Smart Bracelet Screen: OEL Display Module Acceleration sensor: three-axis Roma / low power consumption Battery: Lithium polymer (130mAh) Adaptation method: standalone or use with mobile APP Use time: bracelet is greater than 100 hours Waterproof rating: IP67 waterproof Anti-lost device is greater than 100 hours