Master-slave integration 2-IN-1 HC-05 Module: the original chip corresponds to the master-slave integration function. Master-slave integration can switch between master and slave modes. Through AT command setting, you can select master mode or slave mode. | AT Setting: Press the button and power on the module to enter the AT mode. AT commands are executed only in AT mode, which is easy to use. Default baud rate:4800,Default pin:1234, the default name is HC-05. | On-board 3.3V voltage regulator chip, input voltage DC 3.6V-6V; When not paired, current about 30mA (due to LED lights flashing, current in the state of change); After the pairing succeeds, the current is about 10mA | Working status indicator: Fast flashing LED means no Bluetooth connection, slow flashing means entering AT mode, double flashing means Bluetooth is connected and the port is opened. | Tips:Do not connect the power supply to the signal pin, otherwise the module will be directly damaged. The input voltage must not exceed 7V. (Note: this item doesn't works with iOS.)

Wireless Transmitter Modules: It allow your to wirelessly communicate with radio frequency (RF) controlled devices that operate in the same frequency (433Mhz in this case). | Easy to Use: The antenna has a great influence on the receiving effect of the module,it is better to connect the antenna with 1/4 wavelength. Generally, 50 ohm single-core conductor is used. The antenna length of 433M is about 17cm.(Note:No antenna, please bring your own antenna.) Nice range (using antenna on both), you can send strings (text) from one point to another. If you want to automate your house without pulling cables then this device will help you well. | Note: The VCC voltage should be consistent with the working voltage of the module, and the power filter should be done well; The position of the antenna should be as straight as possible, away from the shield, high voltage and interference source.When used,the receiving frequency, decoding mode and oscillating resistance should match the transmitting. | Applications: The transmitter and receiver modules for increasing the communication distance. And the frequency is 433MHz.It is widely used in remote control systems, such as remote control switch/curtain/sockets/LED/audio/door/rolling gate/door opener, shutter and other door control systems, alarm host, alarm, remote control motorcycle, remote control controlled electric vehicle, remote control MP3, receiving module, automobile anti-theft products, home anti-theft products, electric doors,etc. | Package included: 5 x 433MHz Wireless Transmitter Module+5 x 433MHz Wireless Receiver Module

Operating voltage range: DC 3.0V ~ 30V; Baud rate: 110 ~ 256000bps; Operating temperature range: -40 ℃ to +85 ℃. | Compatible with 3.3V and 5.0V signals; TXD & RXD Indicator: the TTL to RS485 Adapter is designed with Transmit Data indicator light and Receive Data indicator light, convenient for your monitoring. | The 485 bus is with lightning protection and anti-jamming function, with high EMC, EMI performance. When using for long-distance transmission in the field, the module EARTH side please connect to the ground, can achieve well anti-interference and lightning protection function; for indoor short-distance transmission, it cannot connect to ground. | Transmission Distance up to kilometers : with 850 meters of 2*1.5 cable to do the test, it is recommended to use within 800 meters, more than 800 meters plus repeaters. | Package Included:1x TTL to RS485 Signal Converter Module+ 1x 2.54 White Socket with 4P Lines

Stable and reliable chipset CP2102; Supports full range of STC single-chip microcomputer with output voltage 3.3V and 5V; Supports Windows 98SE, 2000, XP, Vista, Window7, Mac OS 9, Mac OS X & Linux 2.40. | Baud rates: 300 bps to 1.5 Mbps, support for the highest baud rate up to 115200 bps. | Standard USB type A male and TTL 5pin connector. 5pins for 3.3V, RST, TXD, RXD, GND & 5V; Connect MCU easily to your computer! | With indicator LEDs: power indicator, the indicator data reception, data transmission indicator. After the driver is correctly installed, the status indicator will be on, the sending and receiving indicators will flash when communicating, and the higher baud rate, the lower brightness. | Application: It is designed to be used for USB to TTL electronic projects. Package included:3* USB To TTL 5 pin UART STC Downloader Module + 3*Jumper Wires

Chipset: FT232RL, Fuse:500MA; not genuine FTDI chip, Working Voltage: 3.3V/5V. | Pins Definition: DTR,RXD,TX,VCC,CTS,GND (Transceiving Communication Indicator:RXD/TXD). | Supports Win95/98/98se/ME/2000/XP/win7 32bit 64bit /Vsita/; do not Support Win8. | This it the link of downloading the driver and filing: http://www.ftdichip.com/FTDrivers.htm. | Package Included: 3 * FT232RL Module.