Feature：This is the paired version of the BT27-A master-slave module, which includes one master bluetooth module and one slave bluetooth module. It has been paired and can be directly connected after being powered on. Note: The master module can only be connected with the slave modules sold in our store, and cannot be connected with any other model Bluetooth module. | Multiple Connection Methods：1. Can search connection Manually; 2. With MAC address code, it can scan QR code for connection. Compatible with Android/iOS. Please note that the slave module cannot communicate directly with the computer. It requires the master module to connect to the computer and use the computer serial port assistant to communicate with the slave module. | Long Range：The connection distance between the BT27-A slave and the mobile phone can reach 150 meters, and the connection distance between the BT27-A master and the BT27-A slave can reach 420 meters(This distance data is the result of testing in an unobstructed and open area. If it is not within the visible range during use, please use the measured results as the main one.). Module size 37.5(L) x 15.7(W) x 4.0(H) mm.Bluetooth BLE 5.1 protocol. DIALOG 14531 main control chip+PA amplifier. Transmission rate 10K Bytes/s. Operating temperature - 40 +85 ℃. Supports UART hardware interfaces. | Wide Application：You can quickly add Bluetooth functionality to your Arduino project, and then you can use an Android/iOS phone to control some small tools. This module is mainly used for wireless transmission of short-range data, such as Bluetooth wireless data transmission, smart home, intelligent educational devices, device monitoring and wireless control, measurement and monitoring systems, industrial sensors and controls, tracking and positioning. | Customer Service：Our products have multi-layer packaging protection: needle guiding sponge, electrostatic bag, packaging bag. It can maximally prevent the product from being damaged during transportation. Out of the box, plug and play. In addition, we provide English technical manual electronic document for customer research. If you encounter any issues, please contact us, and we will resolve your issues within 24 hours.

Wired RS232 Devices to Wireless: Bluetooth to RS232 Converter is very easy to use. With this Bluetooth RS232 adapter, you can wirelessly communicate with any RS232 devices on Android/iOS smartphones. Easy to use, flexible and stable. | Built-in Bluetooth 5.1 BLE module: Long range communication. Compatible with Android phones and iOS devices.This product cannot be directly connected to a computer. If you need to connect to a computer, please use our store's CP11-Master module. | USB/Battery Supply: This product is powered by USB by default,and the switch is set to the USB end by default. If battery power is required, turn the switch to the BAT end. This product has a built-in battery. | RS232 Communication Port: default 9600bps/8/n/1 (baud rate/data bit/no parity/stop bit), module supports software flow control. Supported baud rate: 2400,4800,9600,19200,38400,57600,115200. The VCC power supply voltage range is 4.5V-6V. | Technical Support: Out of the box, plug and play. You can find out testing softwares,user's manuals,devlopment documents,and all resources related to this bluetooth module on our offical website. If you encounter any issues, please contact us by Amazon email, and we will resolve your issues within 24 hours

Built-in BLE 5.1 Bluetooth Module(DX-BT27): This product is suitable for Changing two RS485 devices from wired to wireless communication. Has paired and can be connected directly when powered on. | Wired RS485 Devices to Wireless: Bluetooth to RS485 Converter is very easy to use. Due to its fast communication speed, stability, reliability and security, it is ideal for updating PLC programs, frequency converters, motors, relays, sensors, temperature control equipment, industrial instruments, CNC machine tools and other industrial equipment. | RS485 Communication Port: default 9600bps/8/n/1 (baud rate/data bit/no parity/stop bit). Supported baud rate: 2400,4800,9600,19200,38400,57600,115200. The VCC power supply voltage range is DC 5V-36V. | Baud rate switching method: Briefly press the key twice to switch the baud rate once. The times of flashes of the blue light represent the baud rate number; One flash is 2400, two/4800, three/9600, four/16200, five/38400, six/57600, and seven/115200 | Technical Support: Out of the box, plug and play. You can find out testing softwares,user's manuals,devlopment documents,and all resources related to this bluetooth module on our offical website. If you encounter any issues, please contact us by Amazon email, and we will resolve your issues within 24 hours