The Yves Behar-designed Juicero juicer has been derided on social media after it transpired that a pair of hands could do the same job as the $400 machine.

Behar's studio Fuseproject partnered with San Francisco start-up Juicero to design the Nespresso-style countertop juicers, which use pre-packaged sachets of fruit and vegetables. The machine retails for $400 (£310) and proprietary juice packs for $5-8 (£4-6) each.

However, the derision of Twitter has descended on Juicero following the publication of a Bloomberg Business article that highlights the juicer's limited functionality, complete with a video that shows its juice packets being squeezed by hand.

Hands are even more effective in the case of expired juice packets, which the Wi-Fi-enabled Juicero will automatically reject, having scanned the bag's QR code. The juicer is not designed to process fresh fruit or vegetables from the supermarket.

The Bloomberg article refers to investor dismay at the final product, saying "Two backers said the final device was bulkier than what was originally pitched and that they were puzzled to find that customers could achieve similar results without it."

Bloomberg Business made a video showing that human hands were as effective as Juicero at squeezing juice from a packet

High-profile investors in Juicero included Google parent company Alphabet. The start-up raised $120 million (£94 million) before launching the machine last year, initially with a higher price tag of $700 (£550).

On Twitter, users interpreted the Juicero story as emblematic of the worst of Silicon Valley, which is sometimes criticised for being out of touch and blinded by its own hype.