Abstract: The laser communications systems consist of three main parts are a transmitter, free space channel and receiver. In this work the circuit of mobile laser transceiver has been designed to use for data exchange between computers. The electronic parts that have been used to implement the mobile laser transceiver are laser diode of 650 nm used as transmitter, a phototransistor IS485 has been used as receiver, MAX232CPE is an IC used to as data controller, inverter DM74LS04 has been used to invert the received signal from a phototransistor IS485 and the program that has been designed and used to control the data exchange between computers is Visual Studio 2010. The programs have been used to exam receiving and transmitting file are free serial monitor and WinMerge. A laser beam transmits data form 1m to 20m of range with no errors in different free space conditions. The baud rates that have been achieved are from 9600bps to 256000bps.