The Touchless Siren is a simple hand controlled and triggered dub siren. 
By placing your hand on top of the IR sensor and moving it vertically, you trigger the siren and simultaneously control the pitch of the oscillator and the speed of the LFO. 
Four waveforms can be selected for the main oscillator and five for the Low Frequency Oscillator. 
A blend control lets you adjust the mix with the main oscillator and the LFO. The LFO frequency is either controllable by the LFO Freq potentiometer or by hand with the IR sensor in a certain configuration.
Check out the demo video and the user manual for more information.