It is a BLE 4.0 low consumption bluetooth module that mounts the CC2541 chip. It is also known by HM-10 or AT-09
Chipset based on CC2541
Power: + 3.3 VDC 50 mA
Working frequency: 2.4 GHz
Modulation method: GFSK
Modes: Master or Slave
Bluetooth Class 2 with integrated antenna
Flash 256Kb
40 channels, 2MHz, 3 fixed transmission channels, 37 automatic frequency adaptation hopping data channels,
Output power adjustment (-23dBm ~ 6dBm)
Transfer rate: 6kbps
Feature of Wireless Module AT-09 Bluetooth 4.0 CC2541 IOS BLE security s: authentication and encryption
Power Consumption: Auto Sleep Mode (Standby: 90uA, Transfer: 8.5mA)
The default baud rate is 9600
Default PIN is 000000
AT commands require end-of-line (rn) characters
Firmware is reported as Firmware V3.0.6, Bluetooth V4.0 LE
List of available commands: AT + HELP
Modules report themselves as BT05
Status pin: LOW without connection and HIGH if connected
Working temperature: -5 ºC to + 60 ºC