Do the intercoms need pairing to work? If I add extra units to the existing system, do they need pairing?

No. They’re pre-configured at the factory—just plug in the power and use them right out of the box. Adding extra intercoms also does not require pairing. It's very user-friendly for first-time intercom users.

Why can only one side be heard while the other side can't hear?

Your environment is too noisy, causing interference. For two-way (hands-free) talk, use a relatively quiet place (e.g., a room, living room, or garage). If you need to use it on a noisy jobsite, press and hold “Talk” while speaking for communication

Manufacturer	H HOSMART
Item Weight	422 g
Product Dimensions	16.51 x 7.62 x 15.75 cm; 422 g
Item model number	HY812 intercom
Color	2 station
Style	2 stations
Power source type	Corded Electric
Voltage	5 Volts
Item Package Quantity	1
Temperature Range	-20℃~+60℃ Degrees Celsius
Special Features	Lightweight, Long Range
Included components	Charger, Cable
Batteries Included?	No
Batteries Required?	No

UltraSpeak Intercoms Wireless for Home, Two-Way Real-time Intercom Full Duplex Wireless Intercom System for Home Use, House Intercom System for Business with 1200 Feet Range

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