... LCD,hidden adjustable botton, does not affect the appearance. 2. Hands free: No handset, On-Off SPKR button, emergency button(SOS). ... , hands free circuit use high quality IC integrated circuit, clear voice within 2 meters. 4. Top water-proof: Water- proof design for ... Dial this key to connect hotel service center. SPKR key: Hands free SPKR key, press SPKR key to start communication( indicator light ...