This is the siren included with the VIPER. This siren is for those who want the VIPER sound. It is included with the current VIPER models. Compared to the old 514LN siren, it is one size smaller. By cutting the loop wire (1) on the siren, you can change from 6 tones to a single tone. By cutting the loop wire (2) on the siren, you can change the siren sound.