1. The blue segment at the upper end is the external discharge terminal, and the lower end has the working indicator of the corresponding channel. 2. Voltage and current curve display, real-time voltage and current, DC two-wire method to measure internal resistance. 3. U-shaped groove at the back is combined with PCB board, and the fan actively dissipates heat to form a heat dissipation channel. 4. battery holder using compact battery holder, suitable for flat battery measurement. 5. Channel type: 8 independent channels, each unrelated, independent operation, without mutual influence.<br><br>Channel synchronisation: support 8 channels to set up synchronisation, also can set up each channel parameter individually. Cycle charging and discharging: only support charging-discharging-charging 1 cycle in automatic mode, do not support multiple cycles. Note:Due to different factory batches, there are slight differences in color and appearance of product accessories, but it does not affect normal use. Colour:Green Material:Plastic<br><br>Package Contents: 2 * 21700 battery holder 8 channels dedicated<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.