A security apparatus (100; 200; 300; 400) for a portable electronic device, the security apparatus (100; 200; 300; 400) comprising: at least one support member (101; 201; 301; 401) extending along an axis and comprising, a top surface (102; 202; 302; 402), a bottom surface (103; 203; 303; 403), wherein one of the top and bottom surfaces (102, 103; 202, 203; 302, 303; 402, 403) defines a plurality of support member surface features (107; 207; 307; 407), and opposing side surfaces, wherein the opposing side surfaces (104; 204; 304; 404) comprise a first engagement structure (108; 208; 308; 408); at least two arms (120; 220, 240; 320, 340; 420) coupled to the at least one support member (101; 201; 301; 401) and configured to hold a portable electronic device, wherein at least one of the at least two arms (120; 220, 240; 320, 340; 420) comprises a second engagement structure (123; 323; 423) configured to slidably engage the first engagement structure (108; 208; 308; 408) of the opposing side surfaces (104; 204; 304; 404) of the at least one support member (101; 201; 301; 401) allowing movement of the at least one of the at least two arms (120; 220, 240; 320, 340; 420) to slide in a first direction and a second direction opposite of the first direction along the first engagement structure (108; 208; 308; 408); and at least one locking assembly (170; 270; 370; 470) positioned on at least one of the at least two arms (120; 220, 240; 320, 340; 420), the at least one locking assembly (170; 270; 370; 470) comprising a plurality of lock surface features configured to couple to the plurality of support member surface features (107; 207; 307; 407), wherein the locking assembly (170; 270; 370; 470) is configured that when in a locked position, the support member surface features (107; 207; 307; 407) engage the lock surface features enabling the at least one of the at least two arms (120; 220, 240; 320, 340; 420) to slide in the first direction along the at least one support member and preventing the at least one of the at least two arms (120; 220, 240; 320, 340; 420) from sliding in the second direction along the at least one support member, and and configured that when in an unlocked position by pressing on the locking assembly (170; 270; 370; 470), the support member surface features (107; 207; 307; 407) and the lock surface features are decoupled enabling the at least one of the at least two arms (120; 220, 240; 320, 340; 420) to slide in the second direction along the at least one support member (101; 201; 301; 401). at least one support member (101; 201; 301; 401) extending along an axis and comprising, a top surface (102; 202; 302; 402), a bottom surface (103; 203; 303; 403), wherein one of the top and bottom surfaces (102, 103; 202, 203; 302, 303; 402, 403) defines a plurality of support member surface features (107; 207; 307; 407), and opposing side surfaces, wherein the opposing side surfaces (104; 204; 304; 404) comprise a first engagement structure (108; 208; 308; 408); at least two arms (120; 220, 240; 320, 340; 420) coupled to the at least one support member (101; 201; 301; 401) and configured to hold a portable electronic device, wherein at least one of the at least two arms (120; 220, 240; 320, 340; 420) comprises a second engagement structure (123; 323; 423) configured to slidably engage the first engagement structure (108; 208; 308; 408) of the opposing side surfaces (104; 204; 304; 404) of the at least one support member (101; 201; 301; 401) allowing movement of the at least one of the at least two arms (120; 220, 240; 320, 340; 420) to slide in a first direction and a second direction opposite of the first direction along the first engagement structure (108; 208; 308; 408); and at least one locking assembly (170; 270; 370; 470) positioned on at least one of the at least two arms (120; 220, 240; 320, 340; 420), the at least one locking assembly (170; 270; 370; 470) comprising a plurality of lock surface features configured to couple to the plurality of support member surface features (107; 207; 307; 407), wherein the locking assembly (170; 270; 370; 470) is configured that when in a locked position, the support member surface features (107; 207; 307; 407) engage the lock surface features enabling the at least one of the at least two arms (120; 220, 240; 320, 340; 420) to slide in the first direction along the at least one support member and preventing the at least one of the at least two arms (120; 220, 240; 320, 340; 420) from sliding in the second direction along the at least one support member, and and configured that when in an unlocked position by pressing on the locking assembly (170; 270; 370; 470), the support member surface features (107; 207; 307; 407) and the lock surface features are decoupled enabling the at least one of the at least two arms (120; 220, 240; 320, 340; 420) to slide in the second direction along the at least one support member (101; 201; 301; 401).