DoorBell
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Non-visual Audio Doorphone Intercom Doorbell Security System Support battery AC power
US $26.00Specifications: * Model Number: TL-109AC/DC * Voltage: DC6V(8x AA battery)(4 in each handset) * Output sensitivity: <60mV(frequency 1000Hz) * Frequency response: ±3dB(300Hz-3400Hz) * Noise voltage: <10mV * Ring...US $26.00