Customized for silicone cartoon watches, promotional toy watches and children’s decorative wristwatches, this PCBA is powered by coin cells or rechargeable lithium batteries. Featured with multi-mode LED lighting, vibration alert, simple sound effects and ultra-low power design, the slim compact PCB fits wearable structures and supports mass SMT production. Low operating voltage ensures safe application for kids’ gifts, free promotional giveaways and cross-border toy commodities.

I. Core Functions

• Light Effects: Full-color RGB flashing, fast blink, slow blink, breathing fade and running chasing light; configurable with 3~8pcs of 2835 SMD LEDs.
• Trigger Modes: Push-button activation, shake/vibration sensor trigger and steady-on mode optional.
• Optional Audio Function: Preloaded nursery rhymes, system prompt tones and power-on/off sound effects.
• Power Options
  1. Standard Version: CR2032 coin cell for easy battery replacement.
  2. Rechargeable Version: 3.7V miniature lithium battery with Type‑C recharge port for cyclic reuse.
• Safety Protection: Low-current design, short-circuit prevention and overcharge protection to avoid overheating hazards.
• Power-saving Logic: Auto LED off & sleep after 30 seconds of inactivity to extend battery runtime.

II. Hardware Structure

• Main MCU: Cost-effective domestic 8-bit SOP‑8 microcontroller with built-in PWM dimming and flexible programmable logic.
• LED Driver: RGB LEDs driven directly by MCU or via NPN transistors with current-limiting resistors for component protection.
• Power Circuit: LDO voltage regulator, dedicated battery protection IC and TP4056 charging controller (for rechargeable model).
• Sensor Unit: SW‑520D vibration switch for shake-activated lighting plus tactile pushbutton.
• Optional Audio Circuit: Voice IC paired with micro speaker for nursery rhyme and alert playback.
• Peripherals: All resistors and capacitors in compact 0603 SMD footprint to fit confined watch inner space.

III. PCB & Mass Production Specifications

• Standard PCB Size: 22×14mm, customizable per watch housing design
• Substrate: Thin FR‑4 single-sided PCB
• Manufacturing Process: Full SMT assembly plus partial through-hole plug-in
• Operating Voltage: 3V / 3.7V
• Application: Kids’ toy watches, luminous cartoon wristbands, holiday gifts, marketing free gifts and cross-border best-selling toys

IV. Three Product Versions

1. Basic Version: Single-color flashing light, button trigger, CR2032 coin cell powered
2. Popular Standard Version: Full RGB + breathing light effect, shake vibration trigger, coin cell supply
3. Premium Rechargeable Version: RGB multi-light modes + built-in nursery rhymes + Type‑C charging for prolonged endurance