The universal application of JDY-33 only needs to 4 pins of VCC, GND, RXD, TXD, if in the connected state, disconnect it, send AT+DISC/r, in the unconnected state, you need to send AT+SLEEP in sleep /r,After sleep, it can be woken up by the falling edge of the EN pin, or it can be woken up by sending data through the serial port. Generally, it is recommended to use the serial port to send the AT+VERSION/r to wake up.JDY-33 Bluetooth is based on Bluetooth 3.0 SPP+ design, which can support Windows, Linux, android, IOS data transparent transmission, working frequency band 2.4GHZ, modulation mode GFSK, maximum transmission 6db, maximum transmission distance 30 , support users through AT Commands to modify the device name, rate and other instructions are convenient, quick and flexible to use.The advantages of JDY-33 are very obvious. It supports Bluetooth communication between SPP and computer, supports mobile phone APP or WeChat applet, and also supports communication with JDY-18 master and slave.JDY-33 is a classic bluetooth + dual-mode bluetooth, which can communicate with computers (desktops, ), mobile phones (android) and IOS support bluetooth. Can be used in Bluetooth machines, thermal printers, control, automotive testing equipment, various Bluetooth transparent transmission product applications, shared banks, shared weight scales: JDY-33Communication interface: UARTWorking voltage: 1.8-3.6V (3.3V recommended)Working temperature: 40-80Antenna -in: PCB antennaBluetooth version: Bluetooth 3.0 SPP+ Bluetooth 4.2 soldering temperature: less than 260Working current: 6.5ma sleep current: less than 10UATransmit : 6db (maximum)Receive sensitivity: -96dbmSPP maximum throughput: 16K bytes/(When android, windows are connected with android, computer Bluetooth, the communication speed can reach 16 k bytes per SPP maximum throughput second, and no packet loss (support serial port to send and receive data continuously): 4K bytes/s (android, IOS) When is connected to IO0S or Android, the communication speed is 4K per second (supports 38400 rate to send and receive data continuously, higher than 38400 rate cannot be sent continuously, and it takes time to a delay in the middle)colour: blueMaterial: PVCSize: 26.7x13x1.7 mmPackage Contents:5 x moduleOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.