Industrial Scientific 12 VDC Automotive Charger features charge up to one unit and it is ideal for use with Ventis™ MX4 VTS-K1231100101, VTS-K1231101101, VTS-K1232110101, VTS-K1232111101, VTS-K1232100101, VTS-K1232101101, VTS-K5232100101, VTS-K5232101101, VTS-K5232110101 and 18108631-00. Single unit charger with hook and loop closure assures that the ventis stays in its charging tray.