Dose counter

A dose counter device for an inhaler that registers when a dose is delivered, adapted to be mounted on the distal end of the inhaler, the inhaler comprising a canister comprised in an inhaler housing, wherein the distal end of the canister protrudes a distance from the distal end of the inhaler housing, and wherein the canister has a canister body and further in its proximal end has a dose chamber having a valve and a transfer tube having a valve, wherein the valves are placed a predetermined distance from each other along the longitudinal axis of the canister when the inhaler is in a first non-activated state, and wherein the valves are adapted to communicate with each other when the distal end of the canister in a second activated state is applied with a force that urges the dose chamber over the transfer tube towards the proximal end of the canister a distance that is equal to the predetermined distance, which will expel medicament from the canister, wherein the dose counter device comprises a device trigger provided in an electronic circuit on the distal end of the canister, that the electronic circuit further comprises an acoustic sensor also provided on the distal end of the canister, and a force sensor adapted to activate the acoustic sensor when a force is applied to the distal end of the canister and in that the acoustic sensor registers a dose delivery when it picks up a sound.