Model B40S A comprises a hatch with a flat tray and deep tray that move in opposite directions. The unit comes ready for installation by inserting it into the recess in the counter from above. The flat tray consists of a trough and slider and is made out of acrylic glass. The unit is suitable for handing over files, documents, rolls of money and similar objects. Under the standard setting only the flat tray is used. The deep tray can be activated or deactivated as required. Automatic lock at full extension on operator side. Lock can only be released by the operator behind the counter.