2026 is hailed as the "Year of On-Device AI." From viral accessory concepts to ubiquitous smart wearables, wireless charging has become a critical enabler of user experience.

At the Honor Magic 8 series launch, an unassuming little accessory unexpectedly stole the spotlight—the Honor Select KUMI AI Note Recorder Card.

At just 2.89mm thick and 30g light, it can magnetically attach to the back of a phone or slip easily into a wallet. This is not just a simple recording device; it’s an all-in-one "pocket assistant" that integrates AI audio transcription, mind-mapping, speaker identification, content translation, and more.

In terms of battery life, it supports up to 24 hours of continuous recording and features Wi-Fi quick transfer—"5 hours of recording, 30 seconds to transfer." But how does a 130mAh battery sustain 24 hours of non‑stop recording?

Charging Method 1: Pogo‑pin magnetic charging
Principle: The charging cable has built‑in magnets that auto‑attach for charging.

The catch? You need to carry a dedicated charging dock, and the port design compromises water resistance.

Charging Method 2: Reverse wireless charging from a smartphone

Principle: The recorder card complies with the Qi wireless charging standard, so you can power it directly from any phone that supports reverse wireless charging.

Behind this seamless experience is the NuVolta NU1680 wireless power receiver chip—working silently in the background.

NU1680
The NU1680 is a highly integrated wireless power receiver that requires extremely few external components, significantly reducing system cost and PCB footprint. Its regulator offers a wide adjustable output voltage from 3.5V to 9V and supports real‑time battery voltage tracking to optimize charging efficiency. Compliant with the WPC 5W BPP standard, it’s ideal for TWS earbud cases, electric toothbrushes, shavers, e‑cigarettes, and more.

The "Invisibilization" of AI Terminals
The launch of the Honor Select KUMI AI Note Recorder Card confirms that AI technology is rapidly penetrating every niche, and low‑power wireless charging is now spreading into every corner of AI‑enabled devices.

From smartwatches, TWS earbuds, and recorder cards to AI glasses, styluses, electric toothbrushes, trackers, and even AI companion toys—wireless charging is becoming the standard for AI+ products.

Yet engineers designing these low‑power products are often plagued by these pain points:

• Cost vs. Size: Traditional MTP‑based or state‑machine architectures are costly and require many passives, making PCB miniaturization difficult.

• Coil vs. Frequency: Lack of high‑frequency support prevents coil miniaturization.

• Audible Noise: Conventional ASK modulation generates unpleasant acoustic noise.

To address these challenges, NuVolta has launched the Bow Plus series—a low‑power receiver family purpose‑built for magnetic accessories and AI terminals.

NuVolta Bow Plus Series – NU1682 | NU1685 | NU1687

• Ultra‑small package: All models come in a QFN13 2mm × 2.5mm ultra‑compact footprint.

• Minimalist BOM: Fewer than 10 external components—slashes BOM cost and makes PCB layout a breeze, even in the tightest spaces.

• Silent operation: ASK modulation can be configured as resistive loading to suppress MLCC piezoelectric effects, reducing audible noise—upgrading the experience from "functional" to "delightful."

• Custom private data tunneling: Supports proprietary protocol pass‑through.

• PDET for presence detection: Shuts down Tx when fully charged, cutting Rx IC heat.

NU1682 – Ultimate cost‑performance. Integrated iLOAD modulation, quieter Rx. Supports 5W output and Qi 1.3 / Qi 2.2. Ideal for TWS cases, e‑cigarettes.

NU1685 – The two‑way communication expert. Adds FSK demodulation on top of NU1682, supports private data packet communication and bidirectional comms. Perfect for C‑Pen, smart mice.

NU1687 – The high‑frequency miniaturization pioneer. Supports 1.78MHz high‑frequency operation, designed specifically for tiny coils. Great for VR glasses, game controllers, bone‑conduction earphones. IC‑only efficiency >96%.

High‑Frequency Solution: NU11011 + NU1687
For next‑gen terminals like AR glasses and smart rings, low‑frequency solutions can’t meet the extreme size demands. NuVolta’s NU11011 + NU1687 high‑frequency solution boosts operating frequency to 1.78MHz, dramatically shrinking coil dimensions.

• Coil miniaturization: Higher frequency means fewer turns and smaller area—coils can be as tiny as a fingernail, fitting into micro AI devices.

• High efficiency: At 1.78MHz, IC‑only efficiency exceeds 96%—solving the long‑standing heat challenge of high‑frequency designs.

• High density: The NU11011 uses advanced 2.5D SIP packaging, integrating boost DCDC, MCU, and power stage into one IC.

• EMI‑friendly: SIP packaging reduces parasitic inductance by 30%, greatly improving EMI performance.

The Honor Select KUMI AI Note Recorder Card proves that small size and big stamina can go hand in hand—with just 2.89mm thickness and 24‑hour battery life. NuVolta’s NU168x series low‑power receivers are helping countless innovative hardware concepts leap from prototype to reality.

In the surging wave of AI terminals, wireless charging is not only the gateway for data interaction but also the liberator of industrial design.

If you're looking for a low‑power wireless charging solution that shrinks product size, cuts BOM cost, and supports proprietary protocols—the NuVolta NU168x series is worth your attention.

For more product info and sample requests, contact: sales@nuvoltatech.com