Creating a Walkie-Talkie with generic 433MHz RF Modules?! - YouTube
Source PMR 446 LPD 433MHz KST V2 similar for MOTOROLA Talkabout Radio on m.alibaba.com
433Mhz Wireless Intercom System Secure Walkie Talkie Handsets Extendable for Warehouse Office Walkie Talkie Telephone Intercom - AliExpress
DIY Walkie Talkie
6mhz~500mhz 4w Hf Vhf Uhf Rf Power Amplifier High Frequency For Ham Radio Fm Walkie Talkie Short Wave 433mhz 315mhz - Home Theater Amplifiers - AliExpress