The ELK-120 v.2 features 4 channels that can be configured as 2 channels of siren and 2 channels of voice, or all 4 channels can be used for voice. Either way the voice channels are fully recordable and are stored in non-volatile re-programmable memory. Total time of recording is 8 minutes. The Siren channels offer a choice of: Classic Yelp Sound, Temporal Coded Horn, or Pulsing Industrial Horn.