Bosch ISW-EN1242 Photoelectric Smoke Detector. This product was manufactured exclusively for Bosch for use with the ISW-EN4200 receiver which is different than the standard Inovonics EN4200 receiver. These products have one-way compatibility so if you are changing from the ISW to non ISW line please contact us to confirm compatibility. Direct replacement has no problems..
New with one year warranty.
Product Code: ISW-EN1242