A voice-controlled device, built from your idea.

Send a sketch, a requirements document or a development-board demo, and our engineers in Shenzhen build a working device that listens and talks: microphone and speaker, an offline wake word and commands or a link to an existing speech and AI service, circuit board, firmware and enclosure. There is no minimum order, so one working prototype is a normal start. Our voice builds include two offline voice-controlled four-legged robots, a pocket AI voice companion and a smart planter that holds spoken conversations. You pay in USD to our US entity.

Updated

What you can send

  • An idea or a sketch
  • A requirements document listing what the device must do
  • Code that already runs on a development board
  • A working prototype that needs to become repeatable

Devices we have built

Hand holding a pink 3D-printed rectangular device with a small screen, a microphone hole and a speaker grille

AI voice companion

Pocket device: press, speak, and it answers through its speaker and display, using an existing speech and AI backend.

Pink-and-white 3D-printed four-legged robot with a speaker grille and a microphone on the lid

Offline voice-controlled quadruped

STM32 control board, offline wake word and predefined commands, microphone and speaker, no internet.

Square device in a plant pot showing a small screen, a round motion sensor and a cartoon plant label

PottedBaby smart planter

ESP32-C3, microphone and speaker with an amplifier, spoken AI conversations about the plant.

What we built on the offline voice quadruped

  • Mechanical design: compact 3D-printed structure, four-leg linkage, modular assembly
  • Custom control board: servo interfaces, power management, microphone, speaker, buttons, battery monitoring
  • Embedded software: servo and gait control, offline voice command recognition, 2.4 GHz remote receiver, predefined action library
  • System integration and debugging

The full case →

What it costs

You pay a one-time development fee, then a price per unit that depends on the quantity. Our engineers' reference range for development is about $500 to $3,000 for a simple small device and about $3,000 to $10,000 for a multi-board device. Totals exclude certification (quoted separately) and shipping. Reference figures, not fixed prices; you get a written price before any work starts. Costs →

Engineering notes on sound and voice

Who does the work

Zisheng Li, engineering lead
Embedded systems. 20+ hardware products built. Named inventor on 8 granted patents.
Where it is built
Electronics benches in Shenzhen where our engineers build and debug, and the tool rooms, board and assembly lines we order from. You see each process, not the factory's name. Factories →

How it starts

  1. Send what you have through the project form, by email or on WhatsApp.
  2. If you ask, we send the NDA first. We sign it before we open any file.
  3. We reply within 12 hours, list what is missing and suggest the next build step.
  4. You get a written scope with price and date before any work starts. Major scope changes are re-quoted before work continues.

Questions

Yes. There is no minimum order. We can start with a single prototype and continue into small-batch production after you approve it.

Not necessarily. The two four-legged robots above recognise a wake word and fixed commands with no internet. The AI voice companion and the planter send speech to an existing speech and AI service over Wi-Fi. Tell us which your users need and it goes into the written scope.

You do. We sign an NDA before we open any file. The project-specific design files, drawings and tooling belong to you; our general tools and libraries stay ours.

No. Certification testing is done by a test lab and quoted separately when a product needs it.

Show us the device you want built.

Review my project

Or email chris@anvol.dev · WhatsApp +1 (323) 719-3730