Boltek Advanced Lightning Detection GSM Warning System (ERL10-KIT1)Lightning Detection Early Warning System for South African Mining, Construction and other industries.Boltek is a High accuracy short range detection with three programmable alert level relay outputs designed for use with the EFM-100. The Boltek ERL-10 Kit includes the inverted EFM-100 with pole mount, and pre-wired waterproof enclosure with the ERL-10, EFA-21 (or EPM-1), relay output expansion cable and fault buzzer. Status monitor display software is also provided.