This module is based on Bluetooth 2.1 protocol standards, the operating frequency band is 2.4GHz range, with a strong signal, data transmission, stable performance and other characteristics. Product parameters Working voltage: 2.2 - 4.2V Operating temperature: -40 - 85 ° C Antenna: On-board PCB antenna Wake-up mode average current: 19MA Sleep mode average current: 40uA Characteristics Support Bluetooth SPP serial protocol Built-in PCB antenna Support UART interface Bluetooth class 2 Data transfer is faster than BLE Bluetooth, up to tens of K per second Product range of applications POS machine Bluetooth printer Bluetooth toys Product applications for fast data transfer via Bluetooth