Everything I've tested.

A dream phone to him as a 13-year-old, notable for GPS, 3G and the debut of the App Store.

Looks the same as the 3G outside but is a full upgrade inside in speed, battery and camera.

One of Apple's biggest changes, with Lightning, EarPods and a taller screen that he really likes.

Criticises Apple for reusing the same name for different generations, so buyers have to check the specs to know what they are getting.

He likes them: they sound good and the magnetic play/pause is a useful touch, though the magnets are not very strong.

Converts wired earphones and speakers to wireless, with a well-designed remote body.

A handheld printer that prints on almost any surface, limited to one colour and horizontal content.

A clever clip-on holder with a secure mechanism and a rotating ball.

A very versatile modular rail holder, though it does not look especially secure.

A small fan with sticky pads that packs a punch but has a pointless LED.

A grip with a shutter button, detachable remote and stylus that is more capable than it first looks.

A phone stand, 10W wireless charger and detachable power bank that is pricey but neatly combined.

An umbrella with a battery, USB port, solar panels and a fan, which he calls possibly the world's most advanced.

A tiny 1080p camera with ten infrared lights for night use and motion alerts to your phone.

A MacBook-charger-style plug that feels nice, includes worldwide adapters and doubles as a power bank.

A glass-breaking tool that plugs into the headphone jack, and he confirmed it works.

A tiny Bluetooth clip-on mic that streams audio to your phone without cables.

A pocket-sized gimbal that works better than expected and is hard to fault for the price.

Useful enough that he switched to it as his main keyboard, thanks to one-handed and floating modes.

Brings back a notification LED using screen pixels, but still feels beta and lacks features.

A party trick that pauses games and videos when you look away; he would not use it himself.

An absolutely killer, well-animated live wallpaper that is mostly black to save battery.

A fascinating way to run Android inside Android, useful for separating work and personal use, though it crashes on his Samsung.

He still uses it three times a week to quickly vary a favourite wallpaper.