Cartridge assembly for a dispensing device

A device for modifying a treating surface, comprising:

• a cartridge housing that comprises a locking key mechanism;
• an image capture device, wherein the image capture device is disposed at a first predetermined angle from the plane of the treating surface;
• and
• a cartridge assembly that is configured to engage with the cartridge housing and comprises a plurality of engagement portions, including a primary engagement portion and an auxiliary engagement portion that each extend from a surface of the cartridge assembly, wherein the cartridge assembly further comprises a first end and a second end, wherein the auxiliary engagement portion is disposed closer than the primary engagement portion to the first end, wherein the cartridge assembly is configured to removably engage with the locking key mechanism, when inserted into the cartridge housing in a predetermined orientation relative to the cartridge housing, wherein the cartridge assembly further comprises a dispensing surface, a nozzle array, a plug opposite the dispensing surface, a first side wall, and a second side wall opposite the first side wall;
• wherein the cartridge assembly is disposed at a second predetermined angle relative to the treating surface;
• wherein the device for modifying a treating surface is a handheld device.

A device for modifying a treating surface, comprising:

• a cartridge housing that comprises a locking key mechanism;
• and
• a cartridge assembly that comprises:
• a reservoir for storing a treatment composition, the treatment composition for being applied to the treating surface, wherein the treatment composition is configured for application to the human body;
• and
• a body portion that is coupled to the reservoir and configured to engage with the cartridge housing, the body portion comprising a dispensing surface, a nozzle array, and a plurality of engagement portions, including a primary engagement portion and an auxiliary engagement portion that each extend from a surface of the cartridge assembly, wherein the body portion further comprises a first end and a second end, wherein the auxiliary engagement portion is disposed closer than the primary engagement portion to the first end, wherein the cartridge assembly is configured to removably engage with the locking key mechanism, when inserted into the cartridge housing in a predetermined orientation relative to the cartridge housing;
• wherein the device for modifying a treating surface is a handheld device.