Spec Sheet Preview: These Alpha Communications® / S.T.R.™ TT212 ReliaBUS™ speaker/microphone control module is used with the HT3011 series ReliaBUS™ handset stations to provide intercom amplification and power to operate the associated intercom system, and certain optional components and/or accessories, such as electric door opener(s) etc. The TT212 is used in conjunction with the SP300 ReliaBUS™ controller. These TT212 speaker/microphone control modules are designed to easily mount right onto …