How to programme RT22?
Retevis RT22 is with extremely thin body, light weight, short antenna. After long time wearing, still no burden on weight at all. How to programme RT22?
How to programme RT21?
Retevis RT21 is a hot selling model, elegant, economical price, with scramber function to make your conversation more confidential. How to programme RT21 when you get a new radio at hand?