Price:
US$6.83
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Feature:
Weight: 40g
Power supply: 3 CR1220 button batteries (excluding battery)
Dimensions: 7*1cm
Circuit board material: double-sided 1.6 FR-4 glass fiber board
Functional principle: After welding, it can be rotated on the finger. Can display text, pictures. Three CR1220 button batteries are used in series to supply power. After being stabilized to 5V by the voltage stabilizing chip, it is provided to the single-chip microcomputer with a power switch. The 24 SMD LEDs are controlled by the single chip microcomputer to flash and emit light at high speed according to the font data, using the phenomenon of persistence of human eyes.
Package includes:
1 x DIY KIT