ReceiptPaperPro 2 1/4” x 27 ft Coreless Thermal Paper Rolls, fits POYNT Smart Payment Terminal and Mini Thermal Receipt Printers, 24mm Diameter, 25 Rolls/Case auspowers_batchsix but the screen display nothing

but the screen display nothing

Switch the video channel via the control button

please do not reverse connect the power supply

to add to water testing kits for drinking water

ReceiptPaperPro 2 1/4” x 27 ft Coreless Thermal Paper Rolls, fits POYNT Smart Payment Terminal and Mini Thermal Receipt Printers, 24mm Diameter, 25 Rolls/Case auspowers_batchsix but the screen display nothingReceiptPaperPro 2 1 4 x 27 ft Coreless Thermal Paper Rolls, fits POYNT Smart Payment Terminal and Mini Thermal Receipt Printers, 24mm Diameter, 25 Rolls Case DIMENSIONS Width: 2 1 4 (57 mm) Length: 27 Feet 25 rolls per box 24 mm Outer Diameter High Quality. BPA Free Product Features 2 1 4 (57 mm) Width x 27 ft Length. 24mm outer diameter. 25 Rolls case. High quality receipt paper rolls that produce clear and crisp images that last. BPA FREE with red