Logo design for police vehicle upfitter

Hi-Lo Emergency Vehicles

We install emergency lighting and safety equipment in law enforcement and public safety vehicles (we turn regular cars into police cars).

I am looking for a clean, modern logo. I would like the "Hi-Lo" to be prominent and "Emergency Vehicles" can be less conspicuous. I'm hoping for a logo that includes red and blue (think police lights). The company name comes from the hi-lo police siren, which alternates between a high and low tone. This tone is still used by many European police agencies. In terms of a sound wave, it would look like a square wave (see attached photos). It’s not necessary but would be great if this square wave could be incorporated into the design.