solar powered telephone 太阳能电话 ; 太阳能

Light-powered telephone 光致动电话 ; 光致动

sound-powered telephone 声力电话 ; [通信] 声能电话机

sound powered telephone 声力电话机

electrically powered telephone 电力电话

battery-powered telephone [通信] 电池式电话机

sound powered telephone set 声力电话机 ; 无电池电话

sound-powered telephone system 声力电话系统

repeater sound-powered telephone 增音式声动电话机

sound-powered telephone with volume amplifier 增音式声力电话