Imagine a smartphone that makes handsets like the iPhone 6 look fat and bulky. That’s the Vivo X5 Max, the world’s thinnest smartphone, which measures just 4.75mm at its fattest point. Don’t think its slender form factor doesn’t have enough room for high-end specifications, either.

Vivo really pulled out all the stops to make a smartphone this thin. It designed a special motherboard that’s just 1.7mm thick, makes its display assembly just 1.36mm thick, and used the world’s thinnest mobile speaker, which measures 2.45mm thick. The result is a smartphone that measures 4.75mm at its fattest point, and an incredible 3.98mm at its thinnest.

Inside its skinny chassis, you’ll find a 5.5-inch AMOLED display with a Full HD (1080p) resolution, Qualcomm’s 64-bit Snapdragon 615 processor clocked at 1.7GHz, 2GB of RAM, and 16GB of internal storage — which is expandable via the microSD card slot. The X5 Max also has a 13-megapixel rear-facing camera, and a 5-megapixel front-facing camera.

Of course, with a smartphone this thin, something has to be sacrificed — and that’s the battery capacity. The X5 Max has a 2,000mAh cell, which isn’t all that great. It’s likely going to mean frequent charges when a 1080p display, an octa-processor, and other high-end specifications are involved.

We’ll know more about its battery life capabilities when the X5 Max goes on sale in China on December 22, priced at 2,998 yuan ($486).

• ViaGizmochina