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              3.5 inch Digital Price LabelDisplay size for Digital Price Label: 3.5” Effective display area size: 79.68mm(H)×38.18mm(V) Outline size: 100.99mm(H)×9.79mm(V)×12.3mm(D) Wireless communication frequency: 2.4G Communication Distance: Within 30m (open distance: 50m) E-ink screen display color: Black/ white/ red Battery: CR2450*2 Battery life: Refresh 4 times a day, no less than 5 years Free API, easy integtation with POS/ ERP system 
