Product Name: VHF/UHF Radio Modem RS485 RS232 USB Wireless Transceiver 20DBM 433M 868M Transmitter and Receiver Reminder: One cannot be used alone, please buy 2 or more. This series can be combinations: USB + RS485; wait Description: Working voltage: 4.8V-9V(2A Power Supply is Recommended); Interface: RS232 Frequency: 433MHz/868MHz Transmit power: -40~+20dBm; Receiver sensitivity: -114dBm; Operating temperature: -25~+75; Transparent transmission mode rate : 1200 2400, 4800, 9600(Default), 19200, 38400, 57600, 115200; Open ground Transmission distance : 500M Weight(without antenna): 50g Material: plastic colour: As shown Package Contents: 1 x 433M Wireless Transceiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.