No wiring needed.  Transmit and receive voice communications over any one of three channels, up to 3,200 feet away on the same electrical line with these durable quality intercoms.  Install the FM301A intercom system in a factory, residence, office, or wherever you need them.

Features

• Maximum Audio output power is 250mW (20mV input, 2KHz frequency deviation)
• Transmitting power is >80m@ (10 ohms antenna eliminator)
• Speaker Impedance is 8 ohms
• Power consumption is <3.5 watts
• Supply voltage is AC 110V ~ 127 V  60Hz and AC 220V ~1240V 50 Hz
• Each unit weighs 1.2 pounds and is 6.7" x 5.1" x 1.5"
• Maximum number of connected units is eight

NOTE: In order for this intercom system to work, each intercom in the system must share the same AC phase electrical line.