Amazon seems to have given us a glimpse into some of its new, unreleased products. Listings on Amazon UK show a new Echo Sub, a subwoofer designed to work with Echo speakers, and a new Amazon Smart Plug, a socket adapter with Alexa capabilities, both with an availability date of October 11. Amazon has since removed the listings, but reports from Pocket-lint show images and details of the two new devices.

The Echo Sub looks like a fatter version of Amazon's Echo speaker, almost like a clone of Apple's HomePod . The wireless subwoofer includes a 6-inch down-firing woofer and 100W of bass, tech that would certainly improve the quality of existing Echo speakers. Some complained after Amazon released the updated version of the original Echo last year, claiming its sound quality was subpar.

Listed within the device's description is stereo pairing, a feature that hasn't been available to Echo speakers yet. Currently, users can only group multiple speakers together to fill a room with sound, but they won't get that rich, complex left/right stereo sound. It appears that will be possible with the Echo Sub connected to two compatible Echo devices.

The Amazon Smart Plug appears much like other smart plugs on the market: stick it into a socket in your home, plug in any device you want, and that device instantly gains some smart capabilities. In this case, the Smart Plug brings Alexa features to whatever you plug into it, be it a coffee maker, a lamp, or something else.

Using the Alexa mobile app, you can turn devices on or off remotely, make routines and schedules so those devices are ready when you need them, and more. It also doesn't require a smart home hub, making it easier for customers to buy since they won't have to build an entire smart home ecosystem before they can use it.

Before their listings were removed, the Echo Sub was listed at £75, or about $99, and the Smart Plug was listed at £95, or about $126. The plug's price is confusing because it would be much more expensive than other smart plugs that are currently on the market—some of which only cost $15. It's possible that Amazon hasn't finalized its pricing for the Smart Plug, or it has more capabilities than the initial listing detailed.

The Echo Sub and Amazon Smart Plug may be two of the many forthcoming devices we could see the retail giant announce soon. Reports suggest Amazon could debut up to eight new devices, including an Alexa-capable microwave, at an upcoming event.