Company "Altox" tested the GSM modules ALTOX series GPS-4, WBUS-4 and GSM-4 in an accredited laboratory "Scientific-Research Institute of electronic calculating machines" in a climate camera at the temperature of minus 40 degrees. The tests were conducted at the request of our customers who are interested in the possibility of work the mentioned modules at low temperatures. The tests were conducted in accordance with the technical regulations TNLA TS BY 192052573.001-2014 and GOST R MEK 60068-2-1-2009. The tests confirmed 100% functionality GSM modules ALTOX series GPS-4, WBUS-4 and GSM-4 at the temperature of minus 40 degrees.