Operation: 1. The weight is too low and the screen shows yellow.  LOW light is on, showing LOW 2. Weight up to standard, screen shows green. OK light is on, showing OK 3. When overweight, the screen shows red and alarm. HI light is on, showing HI Feature: 1. Resolution up to 1/15000 2. Single point and linear calibration available Hold function in peak, stable, or key operation 3. Lower/upper limit weighing alarming function 4. Zero range setting and filter setting for counting under various condition 5. Accumulation, Accumulation Display and Accumulation clear functions 6. RS-232/Relay/Blue Tooth/U-KEY connector/WP wireless print/U-disk module/ Wifi/Ethernet(optional) 7. Ideal for applications in production, packaging, warehouse, inventory, shipping and receiving areas Specifications: Model JWI-3000W Resolution 1/15000 Display 142*46mm, LCD 6 digits Housing ABS Weighing units pcs, 斤, Ib ,oz ,g, kg Dimension(mm) 222*176*85 Load cell excitation AC 5V, Up to 8*350 ohm load cells Power supply DC 9V.0.4A/ rechargeable battery (6V/4AH) Video: