Multi-purpose auxiliary device

A multi-purpose auxiliary device comprising a first body, a second body, and a round head kit, wherein:

• the first body has a holding portion and a docking portion, and a cone-shaped center pillar protrudes outwardly from a surface of the docking portion, and a head of the center pillar has a semi-spherical enlarged portion for pressing objects;
• the second body has an opening, and the second body has accommodating space inside that is connected to the opening for accommodating the center pillar, wherein the periphery of the opening extends inwardly with a fastener, so as to be combined with the first body;
• the round head kit has sleeve opening that can be sleeved on the semi-spherical enlarged portion of the first body;
• and
• configuration of the semi-spherical enlarged portion of the first body is provided for a plurality types of key operations, and when the round head kit is sleeved on the enlarged portion of the center pillar of the first body, the first body serves as a capacitive stylus for operating an LCD monitor;
• and when the round head kit is not sleeved on the enlarged portion of the center pillar of the first body, the first body serves as a resistive stylus for operating the LCD monitor, or serves as an electronic credit card signature by using an edge of the holding portion, thus providing versatility and frequency of use for the auxiliary device, and preventing effects of dirt or germs on hands.