The Motorola Droid 4 is the successor to the Motorola Droid 3. It uses a dual-core TI OMAP processor with both cores having a clock speed of 1.2 GHz. The Droid 3 had a dual-core processor with a speed of 1 GHz. The Droid 4 has 16 GB of internal memory which can be expanded with a microSD card up to 32 GB in size. The Droid 4 has a sliding QWERTY keyboard. It also has access to Motorola's Webtop software with the use of either the Motorola Lapdock or HD multimedia dock.