With different lengths are the AK flexible to adjust for any mounting option. Can be used outside and inside. 

dormakaba's elbow contact AK is available in 3 different versions

Elbow 108 AK (AK-UTE) in anodized aluminum with dual internal micro switch.
Elbow AK 205 plastic with built-in micro switch. Can also be equipped with an optional micro switch for dual contact function.
Elbow AK 207 in aluminum with micro switch.

Prisma Elbow switch