ETS Kit: CSM8-SMA1-LP 1 CSM8 Microphone/Speaker, SMA1-LP (2 Watt) DVR Interface Box

Same features as the CSM8-SMA1 aside from lower speaker driver power (2 watts) and a lower overall cost. The CSM8-SMA1 is a better solution for smaller quieter spaces than the CSM8-SMA1. See CSM8-SMA1 for data sheet and installation instructions.