Bell 904 | 4 Way Audio Intercom Kit with Surface PanelBell 904 4 Way Audio Intercom with Surface Panel Included in the Bell 904 kit is a wide 801 handset which is made from smooth, white plastic. The lock release button is positioned discreetly under the handset on the base to prevent accidental usage. When the handset is left off the hook the tone is reduced as an added safety feature. It is possible to have up to 4 handsets per button if required. The entry panel is installed on the surface of the