Wireless Module (200M Range-433 Mhz)

From the shop's description

Description: The HC-11 433MHz Wireless Serial Port Module is based on the TI C1101 ultra low-power wireless transceiver IC. As well as the C1101 wireless transceiver, the module also includes a microcontroller with preprogrammed firmware (no programming required by the user) that provides seamless connection via a TTL serial UART interface. Features: 433.4-473.0MHz operation (depending on channel) Ultra-low power consumption (3.5mA or 22mA depending on mode) with sleep option (80μA). 10dBm output power and high sensitivity providing long range in the open environment. 3V～6V operating voltage. Serial pass through mode to replace the serial cable (half duplex). IO pass through modes. 3V interface with 5V tolerance. You can set the frequency and set the address, and dozens of instructions, automatic filter 8.Small size (13.5 × 28.2mm). 255 selectable addresses 20 selectable channels Default Settings: Baud rate: 9600 Channel: 1 Module address: 0 Tx Power: 8 (10dBm) Pin definition and Rating Pin # Pad Type Description VCC 1 3.3-5V Integrated supply with on-chip linear regulator output within 3.3V-5V GND 2 VSS Ground port RXD 3 CMOS input with weak internal pull-up UART Data INput TXD 4 CMOS output,tri-stable with weak internal pull-up UART Data INput Key 5 CMOS input with weak internal pull-up AT Mode control