... , large LCD,hidden adjustable botton, does not affect the appearance. 2. Hands free: No handset, On-Off SPKR button, emergency button(SOS ... ). 3. Clear communication, hands free circuit use high quality IC integrated circuit, clear voice ... Dial this key to connect hotel service center.SPKR key: Hands free SPKR key, press SPKR key to start communication( indicator ...