The 390V1 (M-Cable tag) is an Alien Higgs 3 EPC Class 1 Gen 2 RFID tag that operates from 865 to 868 MHz. It is a high temperature tag that can operate from -40°C to +85°C & is specially designed for applications like boiler and engine identification. This tag has a very good read range, especially when attached to the metal. It measures 28 x 15 x 5 mm.