What is new for PointWrite-PW21U compared with previous PointWrite modules?

PointWrite-PW21U are with improved features.
(1) Improved interactive performance: dynamic light sensing will sense every second for interference block guarantees smooth writing
(2) Resume when interference disappears
(3) External light literference occurs less
(4) Freezing improvement
(5) Improved writing experience: new algorithm improves jigging issue
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