Shop name: Chong Qing Shuo Yue Ke Ji You Xian Gong Si Product Name: VHF/UHF Radio Modem RS485 RS232 USB Wireless Transceiver 20DBM 433M 868M Transmitter and Receiver Reminder: One unit cannot be used alone; please purchase 2 or more units. This series supports combinations: USB + RS485 Working voltage: 4.8V-9V (2A power supply is recommended) Interface: RS485 Frequency: 433MHz / 868MHz Transmit power: -40 to +20dBm Receiver sensitivity: -114dBm Operating temperature: -25°C to +75°C Transparent transmission mode rate: 1200, 2400, 4800, 9600 (default), 19200, 38400, 57600, 115200 Open ground transmission distance: 500M Weight (without antenna): 50g Material: Plastic Color: As shown Package Contents: 1 x 433M Wireless Transceiver Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. Measurement allowed error is +/- 1-3cm.