Summer staple territory: JISULIFE’s portable handheld fans sit in the same space as the popular mini USB fans from brands like EasyAcc and O2COOL, but with a more polished, pocketable feel. This listing is for a twin pack, so it makes sense if you want one for commuting and one for the desk, or to split between two people rather than fighting over a single fan on a sticky train.

Who will actually get use out of a 4,000mAh handheld fan?

A 4,000mAh battery is the headline here because it’s what turns a novelty into something you’ll keep in your bag. Expect it to cope with a full day of on-and-off use, rather than dying after the lunchtime rush. Being rechargeable also means you can top it up from a power bank, laptop, or car USB when you’re out.

• 2-pack value — useful for home + office, or keeping a spare charged.
• 4,000mAh rechargeable battery — better stamina than the tiny-capacity minis that fade quickly.