This week's picks were slim — the RF search results were dominated by YouTube Shorts, hashtag spam, and clickbait "free electricity" videos. But one project stood out from the noise: koda's portable RF tool build combining an ESP32 with an nRF24L01 radio module, packaged into a self-contained handheld device with multi-day battery life.

What makes this worth watching is the intersection of skills involved. Building a portable RF tool isn't just about wiring up a radio module — it requires thinking about power management, physical packaging, and making design tradeoffs between capability and portability. The ESP32 is a popular platform for wireless experimentation, and pairing it with the nRF24L01 opens up the 2.4 GHz band for scanning, packet analysis, and communication experiments.

The battery life claim is the most intriguing part. Getting "multiple day" runtime out of an ESP32 — a chip notorious for its power hunger when radios are active — suggests the creator put real thought into sleep modes, duty cycling, or power supply design. These are practical embedded engineering challenges that many hobbyists struggle with, and seeing a working solution in a compact form factor is genuinely useful.

A caveat: the video description is essentially empty, so it's hard to know the depth of explanation before watching. This is a maker-style build video rather than a polished tutorial. But for anyone interested in portable RF projects or ESP32 power optimization, the real-world build experience on display here beats the recycled Arduino demos that flood this space.