Integra VIAFLO 4636 12-Channel 50ul Electronic Pipette - No Power Supply 135469927285 but a popping sound is

but a popping sound is heard from the speakers upon startup

There is no back box included

Manufacturer Chemglass Model Number CG-1506-86 SKU 19-64755 Ref 23-91616

Includes Savant Keypad Link

Integra VIAFLO 4636 12-Channel 50ul Electronic Pipette - No Power Supply 135469927285 but a popping sound isCondition Used Description This item is fully tested and in excellent working order. Item will come with a 30 Day Warranty. Cosmetically in good condition showing minor scuffs scratches blemishes from previous use. Includes 12 Channel 50ul Electronic Pipette as pictured. No additional items or accessories are included. Unless pictured, no power adapter power cable included. Photos are of the actual unit for sale. Inventory is on hand and ready to