Kustom 10W Car Cup Holder Extension Fast Wireless Charger TrayKustom Car Cup Holder Extension 10W Fast Wireless Charger Tray Instruction: 1. Insert 4 fixation rubbers to each hole under the cup holder extension and install to the car cup holder (To make it tight, 3 jagged part of fixation rubbers may be re arranged). 2. Press tightly the cup holder extension into the car's cup holder so it does not shake. 3. Insert the cup holder following the wide hole on cup holder extension, and rotate the cup holder to fit