Non-visible Doorbell Wired Two-way Phone Intercom Directional Calling

Features:
This Productcan Be Used in Apartments, Villas, Hotels, Offices,Pblic Buildings etc.
Two-Way Call And Intercom,Convenient For Double Rooms.
Plug into 220V AC Power.Or Insert 4 Cells of R6P SIZE AA1.5V.
Ring No Matter Whether You Take Up You Handset Or Not.
While Talking, Please Speak Into The Microphone.
The Talk Back Set Is Still In Working Condition And Continue To Consume Electricpower.
Please Pay Attention To The Colour Of the Two Different Conductors.
The Ring Sounds Level Can Be Selected.
Specifications:
Output Sensitivity:<60mV ( Frequency 1000 Hz
Frequency Response:±3dB ( 300Hz-3400Hz )
Noise Voltage:<10mV
4ring Sound level: >70dB ( AT 0.5m )
5Quiescent Current:<5uA
Intercom Working Current:<100mA
50 Meters: RVV2*0.5MM
100 Meter: RVV2*0.75MM
Installation: Wall Mounting
Item Type: Intercom System
Model Number: P-02
Connection Type: Wired

WARRANTY

We'll refund your money if the item hasn't been delivered within 40 days after purchase. You have 2 weeks to request a refund — until day 60.
Product doesn't match the description? Contact us within 30 days after you receive it!
In case of cancellation, money will be refunded to your account within 3 days.