The Walkie Talkie can only be used if the player is in an alliance and can only be used every 6 hours. The Walkie Talkie can speed up army travels, unit construction, and building Construction.
Once used, the Walkie Talkie will post a message in chat that will allow others to help speed your request up. The request that is posted in chat can then be tapped on by other players that will speed up your request and give the player who tapped it a reward.
A request can only be sped up a total of 10 times.
The actual time increase given by the speed up is minimal, however assisting other player's speed up requests can provide elite recruits and other items that are very beneficial.