The IS28 Banshee is an intrinsically safe sounder for use in hazardous areas. It is available in either high or low frequency versions each with four tones: buzz, fast sweep, slow sweep and continuous. The high frequency unit has a sound output signal based on 2,600Hz for maximum audibility. The low frequency model has the sound output centred on 900Hz to satisfy installations that demand a low frequency sounder. The IS28 has been ITS approved to ATEX and is suitable for use in all zones (0, 1 and 2). The IS28 has also been approved to IEC Ex by Testsafe for mining applications.