Модел Topcom TwinTalker 1100
По документация работят до обхват 3 км.
Type: License free PMR446 transceiver
Frequency range: 446.00625-446.09375 MHz (Eight PMR446 channels)
RF Power output: Max 0.5 W
Voltage: 4.8-6 VDC (4*LR03 / AAA)
Без батерии са.
Цена 15 лв за двете
https://www.manualslib.com/manual/608373/Topcom-Twintalker-1100.html#manual
https://www.amazon.nl/Topcom-Twintalker-Combi-Pack-radiografisch-apparaat/dp/B00020ILOA