This is a REVIEW for the K&F Concept 2-in-1 Magnetic Compressed Air Cleaner/Vacuum with Internal Rechargeable Battery, sold on Amazon with the description:
“K&F Concept 2-in-1 Magnetic Compressed Air Cleaner, Air Duster with 2 LED Lights | 300,000 RPM Super Power Wind | 3 Speeds | Rechargeable Brushless Motor | for PC, Keyboard, Car, Outdoors”
This is not a compressed air system; the air is simply forced (suction and expulsion) by the action of a turbine at a very high speed, and the cone attachment at the outlet reduces the duct slightly. The engine is very powerful and also quite noisy at the third power level (it has a normal conventional speed mode (= red), another of considerably faster speed with greater blow-up or suction (indication = green) and another high-speed turbo mode where the metal turbine (multi-bladed, it seems from its rear that it is made of steel) buzzes so loudly it sounds like an airplane is about to take off) this last one with indication = blue, and you can switch between them sequentially with each press of the engine start button). The chassis of the housing has a honeycomb-type steel mesh in the suction area with holes of one millimeter or slightly more. An accessory for the specific vacuuming mode is then attached, featuring a micro-perforated steel membrane filter and an extension brush that fits into the suction container. However, while it does pick up lint, small particles, and hair, its vacuuming function isn't the most efficient. Its performance as a blower is much more noticeable, and for blowing, it has a small cone that magnetically attaches to the back of the vacuum. It also comes with various types of brushes of different sizes and bristle types (some stronger and shorter, others longer and softer) to assist with blowing. Therefore, when cleaning keyboards or the ventilation circuits and interior casings of electronic devices, it's advisable to always do so outdoors or in very well-ventilated areas.

I really miss having accessories for using it as a blower, since it only has this rear cone for blowing, and some air mattresses or inflatables have the typical traditional translucent valve with a much smaller diameter, requiring an extended tube to press their internal sealing valve system, which allows air to enter easily. It also has a light/flashlight function on the blower itself (air outlet) with a separate button, and a lower white LED next to the power (ON/OFF) button that can be activated as a flashing emergency light. Alongside these, also on the bottom, is the USB-C charging input connector (a USB-A adapter cable is included) and four small LED holes to indicate the remaining battery charge or the charging process (each one represents 25% of the charged battery when illuminated). Charging isn't very fast, but in return, the battery life in normal blowing/vacuuming mode is quite good, lasting several days with moderate (not intensive) occasional use. In mode 3 (blue), the internal battery life is significantly reduced if used for several minutes multiple times a day. There are other models on the market with a more cylindrical vacuum tube shape that I personally find more appealing than this pistol-grip one. However, I have to admit that its performance as a blower is quite good, though a bit less effective as a vacuum. For this reason, and as I've already mentioned, even though it's a K&F product—a brand I love for practically all their items due to their excellent quality/price ratio—I can't give it the highest rating this time. Therefore, I'm awarding it:

"" 4 STARS "" = [ * * * * ] .
I hope you find this review helpful. Happy shopping! Best regards. :*)