868Mhz - 3 channel bi-technology transmitter, key fob design - Contains a MIFARE chip for use with proximity readers - Powered by 3V CR2032 type batteries - 3 channels: Operation in open field 80 to 120m - ABS housing - Engraved - Available in 2 colours - Operating temperature: -20°C to +50°C - 3-colour LED warning light - Flashing red/green light = change the battery