The BBX-3E is a back-box from Aiphone which is specially made to be used with the LEF-5C/10C. The BBX-3E back-box comes with a high quality and strong construction, a lightweight design, and is capable of being effortlessly installed for all operators. The BBX-3E back box is user friendly, provides flush mounting, and offers a cost effective installation solution for the LEF-5C/10C which helps to save money.