Asus AW1500-I5 - Manual (Page 43)

User’s Manual 2-23
2.7 Screwless Expansion Card Slot
The AW1500-I5 chassis is designed with a screwless expansion card slot
for Personal Computer Interface (PCI) card installation convenience.
To add or remove expansion cards, follow these steps:
1. To open, push the lever to the left using your thumb to release the
spring lock.
2. To lock, make sure that all expansion cards are properly inserted in the
slots, then pull the spring lock lever to fasten the expansion cards in
place.