for the nights you can't watch
She'll hide it.
Someone should notice.
Guinea pigs hide illness until it's serious. Guinea Guard clips to the cage and watches through the night, so you find out early — while it's still easy to fix.
$200 pre-sale · $260 at launch · refunded if we don't ship
Bean & Mochi
Small, quiet, sees in the dark.
- Clips to the cage wire. Plugs into a phone charger.
- Infrared camera for the night, a microphone for breathing.
- Everything runs on the device. You get one note in the morning — not a live feed to babysit.
The box you see is the engineering prototype — everything inside is done and working. The case it ships in is being designed right now, and reservers get a vote on it.
Working prototype, photographed above — no renders of the device on this page. Two patents granted. Not a vet, not a diagnosis — a heads-up, with the clips to show yours.
One night.
How it works, told the way it happens.
Mochi eats a little less than usual.
you wouldn't notice. nobody would.
She tucks herself into the hideout. You turn off the light.
guinea pigs hide when something's wrong. it looks like sleeping.
She hasn't moved in forty-seven minutes. Guinea Guard notices.
not sleeping. not moving.
A small click each time she breathes. The microphone catches it.
you keep sleeping. that's the point.
Mochi was unusually still overnight (47 min) and had two breathing sounds around 3:40. Worth a call to your vet today — clips attached.
One note, in plain words. No graphs to decode.
"You caught it early." Ten days of oral antibiotics at home — not a night on oxygen.
same infection. different ending.
I didn't catch it early.
Four guinea pigs, five years, and about $4,000 in vet bills — most of it from the nights I slept through. Guinea Guard is the thing I wish had been watching.
— Zisheng Li, founder
Straight from the test bench.
A frame from our 384-hour continuous run: four pigs, told apart and tracked, behaviour read — all computed on the box itself.
- Brain
- CanMV K230D — RISC-V with a 1-TOPS NPU. The 1.2 MB model runs at 13 fps on the box itself.
- Eyes
- 1080p camera (GC2093) with infrared night vision.
- Ears
- On-board microphone sampled at 44.1 kHz, listening for breathing sounds.
- Power & link
- USB-C, about 3 W — any phone charger. Wi-Fi that reconnects itself.
- Testing
- 384 hours of continuous running; detection checked against 25,000+ hand-labelled frames.
- Privacy
- Video is analysed on the device. The full device privacy policy comes before anything ships.
Reserve yours. $20 today, nothing else until it ships.
This is a pre-order for a product still in development, so shipping isn't guaranteed yet. We go into production only once 500 units are reserved. If we're not there by 31 December 2026, every deposit comes back — automatically.
Pre-order. First units targeted for spring 2027 — not guaranteed. Secure checkout by Stripe. We email you before the balance is due.
Quick questions
- Will it fit my cage?
- It clips to cage wire. C&C grid or open pen? Tell us when you reserve — we're designing mounts around what reservers actually have.
- I have more than one pig.
- Good. It tells them apart — up to four — and keeps a separate "normal" for each.
- Rabbits? Hamsters?
- Guinea pigs first. Reservations decide what we build next.
- Changed my mind?
- Email chris@anvol.dev any time before the balance is due and we'll refund the deposit.