4 Sets Retevis H-777 Walkie Talkie UHF 50Ω 5W 16CH PMR446 2-Way Radio UK Ship
Just what I was looking for
I used these radios at a mountain bike race I organised, the signal was good over the whole track. There was never more than 1km between each post but the area was heavily wooded.
Bicycle Rear Derailleur Hanger Extension Bike Frame Gear Tail Hook Extend UK CNC
Does the job
Works great, allows you to use a bigger cassette