Bluetooth bracelet EF-1

Specifications: A: Compatible with Bluetooth 2.1 standard B: Class 2 standard (10 meters) C: Operating Frequency: 2.4GHz D: Effective distance 5-10M E: automatic power saving mode F: Easy to operate low-power G: security authentication, data Encryption main functions: A: caller's name and number display B: After losing a Bluetooth connection, 5-10 meters vibrating alert C: call vibrating alert D: can answer / call / hang up E: Support external earphone F: Support MP3 Play G: synchronous telephone number contacts H: time display