Amazon’s Kindle e-readers, Fire tablets, Fire TV set-top box and Fire Phone are only the start of its hardware ambitions, judging by a US government document reported on by Reuters yesterday. The document focused on Amazon’s plans to invest $55m in its Lab126 division, which has been developing the company’s own hardware in recent years. The report provides more detail, suggesting that two areas Amazon is looking at are a “simple wi-fi device that could be placed in the kitchen or a closet, allowing customers to order products like detergent by pressing a button” as well as wearable devices. In separate news, Amazon has confirmed that the company’s current head of digital music and video, Bill Car, will leave the company by the end of this year. And yesterday also saw the UK launch of Kindle Unlimited, Amazon’s Spotify-for-ebooks style service that charges £7.99 a month for unlimited access to a catalogue of 650,000 e-books and 2,000 audiobooks.