Just as it arrives on the market, the Apple Watch Series 4 can’t keep up with high demand. The smartwatch already needs another manufacturer that can keep pumping out units around the world.

Apple reached an agreement with Compal Electronics that’ll increase mass production of its smartwatch, according to DigiTimes. The orders leading up to this were left to Quanta Computer, but the Apple Watch Series 4 might be experiencing much better demand than anyone in Cupertino expected. Now there are reportedly two manufacturers signed on to roll out units.

The Apple Watch Series 4, according to analyst Ming-Chi Kuo, should see 18-19.5 million units shipped in 2018. Apple doesn’t comment on sales for its smartwatch, but we suspect there will be something said about its performance against alternatives in the wearables space.

Some of the new features include a larger display, a digital crown with haptic feedback, the S4 chip, an electrocardiogram sensor, and improved battery life. The Apple Watch Series 4 wants you to live active, healthy, and connected. Maybe that’s enough to drive more sales than usual for this line.

If you’re ready to jump on the Apple Watch, the latest model starts at $399. But that price goes up when you consider LTE connectivity, premium casings, and different bands.