I originally bought a Sendt lock because it was white and I wanted that color. Unfortunately Sendt does not work with this Acer ConceptD 2-in-1. Kensington did, however, and was drama free. The code was easy to install and just fit and worked. I recommend Kensington for Acer branded laptops. Many other brands have also been listed as compatible. Too bad the lock size isn't standard across all brands.
Enhanced Kensington Cable Lock for HP Laptops, Lenovo, Asus, Acer & Other Devices - Compact & Reinforced Pivoting Lock Head (K65035AM)
11 Review
Secure Your Laptop with the Kensington Portable Laptop Combination Cable Lock - Letter Combination Lock (K64684US)
11 Review
RUBAN Notebook Lock and Security Cable: Protect Your PC/Laptop with Two Keys and 6.2 Feet of Cable (Black)
11 Review
π Black Kensington Portable Combination Cable Lock for Laptops and Devices (Model K64670AM)
10 Review