# telegraph activity ![](/static/mb/lessons/telegraph-0.png) ### ~avatar Build a telegraph between two @boardname@s to communicate with your friends! ### ~ ## Duration: ~30 minutes ## Materials * @boardname@, battery holder and 2 AAA batteries * Crocodile clips ## Activities * [Make](/projects/telegraph/make) * [Code](/projects/telegraph/code) ### ~button /projects/telegraph/make Let's get started! ### ~