and HM-11 series module use TI CC2541 chip, configure 256KB space, and support the AT . Users can change the role (master, mode) and the serial rate, equipment name, matching password and other parameters on-demand. It is very flexible to use. Features - The most complete, most convenient, and most stable data transmission, remote control, and data acquisition module. - Master- in one, transparent transmission, replacing serial . - Remote control, transparent transmission, MCU is unnecessary. - Remote data acquisition, transparent transmission, MCU is unnecessary. Parameters - Protocol: Specification .0 BLE - USB Protocol: USB - Operating Frequency: 2.4GHz band - Modulation Mode: GFSK ( Frequency Keying) - Transmitting Power: ;4dBm - Sensitivity: ;-84dBm .1% - Transmission Rate: Asynchronous: 6 kbps - Synchronous: 6 kbps - Security Feature: Authentication and encryption - Support Service: Central Peripheral UUID FFE0, FFE1 - Power Supply: +3.3VDC 50mA - Operating Temperature: -5 - +65 Centigrade - Physical Dimension: 27mm x 13mm x 2.2 mm. Application - Industrial remote control, - POS system, and keyboard, mouse, and joystick - Automobile testing equipment - Portable, battery-powered equipment - Automation data acquisition - toys - Wireless LED display system - printer - and Industrial Control Package list: 1 * 4.0 Master Module for R3 Mega 2560 Nano