Abstract: Disclosed is a mounting base (300) for attaching a portable electronic device (402) to a collar apparatus (400). Mounting base (300) includes a frame (102) and a latch (200). Latch (200) is moveable between a latched position and an unlatched position. Latch (200) includes an actuator (206) with a button (208) that may be depressed by a user to manually move latch (200) between the latched and unlatched positions. A portable electronic device (402) includes an insertion portion (410) that is received in a receiving aperture (108) in the frame (102). Once the insertion portion (410) is inserted, the device (402) may be rotated manually to engage latch (200). During rotation, a lock stub (216) on latch (200) engages a corresponding feature on insertion portion (410), thereby preventing counter-rotation of device (402). Additionally, one or more tabs (120) on frame (102) interfere with corresponding structure on insertion portion (410) to secure device (402) onto mounting base (300).