Intertalk WC121 Wired Intercom System Gate Entry for Home/office Doorbell Security

1) Home security system - Ideal for door answering : Door bell + door guard............. * Check out who is outside before open the door * Monitor outside door area - Battery-Powered for noise-free (free from house power-line static noise) conversation in Home, Office, Nursery, Shop, Inquiry, Counters and Boat - Power source : DC 6 volt. 4 x AAA battery (not included) - AC adapter jack on Master Unit (AC adapter not included) 2) monitoring. - Let you monitor another room with confidence : With TALK back feature * Talk back to comfort your baby, kinds, or communicate with sick people or senior (hands-free) * No interference from cordless phone, walkie-talkie, or other baby monitors (radio frequency) - Convenient Front control rotary power ON/OF more »