The AI Recorder Card (model WB-RC100) is a bank-card-size AI voice recorder, 86 × 54 × 3.2 mm, that records on its own and sends the audio to your phone over Bluetooth. The free app turns it into text with speakers labelled, writes AI meeting notes, finds to-dos, translates live and answers client questions from your own knowledge base. This guide explains every feature, why we built it and what we measured.
A phone is a good recorder until it has to record a call, run for hours, or stay free for other work. These are the five gaps the card closes.
| Phone recording | What happens | With the recorder card |
|---|---|---|
| Calls inside apps | WhatsApp, WeChat and similar calls cannot be recorded by the phone system | The card sits on the back of the phone; its bone-conduction mic picks up the earpiece, so calls in any app are recorded, without speakerphone |
| Regular phone calls | Many Android phones block call recording; iPhone call recording announces itself | Recording happens in the card's hardware, not through phone permissions |
| Long meetings | Incoming calls interrupt, apps get closed in the background, battery and storage run low | The card records on its own for about 15–20 hours; a 32 GB card (29 GB usable) holds about 255 hours, or about 4,300 hours with Opus-only firmware |
| Your phone is tied up | The phone must stay on the table, recording | The card records; you keep using your phone and sync later |
| Pickup | A phone at the end of the table misses voices | Two omnidirectional mics plus one bone-conduction mic |
Laws on recording calls differ by country and state. Always follow local law and ask for consent where required. Headphones can't be used in call mode, because the card listens to the phone's earpiece.
The card records and stores audio by itself, so an incoming call, a locked screen or a flat phone battery cannot stop a meeting recording. When you open the app it reconnects to your card without a scan. Recordings come over Bluetooth Low Energy as Opus audio at 2,000 bytes per second, about 7.2 MB per hour. The card also keeps a WAV copy (16 kHz, 16-bit, mono), and the magnetic cable connects it to a computer as a USB drive (about 8 MB/s read, measured).
Some people want everything automatic; others only need a few recordings and want to save phone space and transcription minutes. The app supports both.
A two-hour recording may contain forty minutes of actual talking. The app runs on-device voice activity detection first and sends only the speech, so silence costs nothing. Transcripts come back with speakers labelled.
Having a transcript is not the same as having notes. Different situations need different outputs, and searching a long recording by ear wastes time.
Promises made in a meeting are easy to forget. After transcription the app lists every action item with its owner, the spoken deadline and the minute it was said.
A doctor needs a medical record, a lawyer needs a statement, a sales rep needs next steps. Scene analysis formats the same transcript for the job.
Some moments can't wait for a transcript: a talk in another language, a client call, a conversation across languages.
Sales and support staff can't remember every spec and price, and looking things up mid-call sounds unprepared.
Recordings hold meetings, patient details and client data. A card that is lost or lent should not hand them over.
The card is the size of a business card and 3.2 mm thin, with a metal body, so it fits a card holder or wallet and is used every day.
| Uses minutes | File and live transcription, billed per second of actual speech; 12 less common languages count three times |
|---|---|
| No minutes, needs an active account | AI summaries, mind maps, Ask, to-dos, scene analysis, live translation, read-aloud, teleprompter answers (with a daily allowance) |
| Free, no account | Bluetooth download, playback, export, demo mode, knowledge-base editing, search, importing audio |
| Gift | Each card adds 60 free minutes on first connection |
Samples ship within one week. Brands, distributors and teams can ask about custom logos, white label (our app under your brand from 500 units, with a 10% revenue share) and the open Bluetooth protocol.
Yes. Place the card on the back of the phone in call mode. Its bone-conduction microphone picks up the earpiece, so calls in WhatsApp, WeChat or any other app are recorded without speakerphone. Follow local recording laws.
About 15–20 hours of continuous recording per charge from a 400 mAh battery (display off). A 32 GB card (29 GB usable) holds about 255 hours, because the current firmware stores an Opus and a WAV copy; with Opus-only firmware for volume orders it holds about 4,300 hours.
In our tests one hour of audio (7.2 MB) transferred over Bluetooth in 229 seconds, about four minutes. Other phones or longer distances can be slower.
70 recording languages for transcription, routed automatically to the best engine: Qwen for 17 major languages (Chinese, English, Japanese, Korean, German, French and others), OpenAI for most of the rest, and Microsoft Azure Speech for 12 premium languages billed at 3× time. Live translation can target up to three languages at once, and the app interface is in English and Simplified Chinese.
No. The app detects speech on the phone first and only sends the speech, and billing counts actual speech seconds.
Yes, with the same protocol. On iPhone, live captions pause while the app is in the background; the card keeps recording.
Only during processing: audio at most 2 hours while transcribing, transcripts for 7 days. Knowledge base and to-dos stay on the phone.
Yes. We laser-engrave logos and print branded packaging, in small batches. From 500 units you can also offer our app under your brand.
You don't need to start over. If Bluetooth drops, the app keeps retrying and looks for the card for up to 30 minutes; when it reconnects, the transfer resumes from where it stopped. In one test we switched the card off at 11% complete, and after powering it back on the app reconnected and finished the transfer automatically.
You can connect it to a computer over USB, but over Bluetooth the app can only read recordings — files copied onto the card from a computer are not visible in the app.
Not by default. Turn on "Delete from card after download" in Settings to free up space automatically once a recording is fully on your phone.
Turn on "Bind my recorder card" in Settings (off by default). Once bound, the card can only be read by your account; anyone else connecting with the app sees no recordings, even on iPhone, where the card is identified by its own unique ID.
Recordings are Opus-encoded on the card (16 kHz mono, about 16 kbps). On the phone you can export Ogg (Opus) or WAV audio, and the transcript as text.
AI HW Stack is operated by PINGOOD TECHNOLOGY CO. LIMITED (Hong Kong), which handles contracts and payment for overseas customers, together with its Shenzhen R&D company and factory.
Updated 2026-10-24