I am lucky enough to get my hands on a Realistic TRC-86, the walkie talkie they used in the series. Not sure if it works but just to have as display is
Realistic TRC-214 Walkie Talkie iPhone Case – vajacases46.com
3D Printed 80's Radioshack Inspired Walkie Talkie Cosplay - Etsy Israel
Trc214 Walkie Talkie - Etsy
Vintage 80s Walkie-Talkie Realistic TRC-214 by 3dtreatment | 3DOcean
What are the walkie talkies called on Stranger Things? - Quora
Vintage 80s Walkie-Talkie Realistic TRC-214 by 3dtreatment | 3DOcean
Stranger Things Cosplay 2x Antenna Coil Loads for Realistic - Etsy