verykool s4009 Crystal vs Xiaomi Redmi Note 9 Pro Max

Key differences

Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

• Width

  s4009 Crystal: 10.7 mm narrower

  s4009 Crystal:

  66 mm

  Redmi Note 9 Pro Max:

  76.7 mm

• Screen diagonal

  s4009 Crystal: 2.67 in smaller diagonal

  s4009 Crystal:

  4 in

  Redmi Note 9 Pro Max:

  6.67 in

• Chipset

  s4009 Crystal:

  Mediatek MT6570 (28 nm)

  Redmi Note 9 Pro Max:

  Qualcomm SM7125 Snapdragon 720G (8 nm)

• Rear camera layout

  s4009 Crystal:

  Single

  Redmi Note 9 Pro Max:

  Quad

• Depth

  Redmi Note 9 Pro Max: 1.9 mm thinner

  s4009 Crystal:

  10.7 mm

  Redmi Note 9 Pro Max:

  8.8 mm

• Height

  s4009 Crystal: 38.5 mm shorter

  s4009 Crystal:

  127 mm

  Redmi Note 9 Pro Max:

  165.5 mm

Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

1. 1. s4009 Crystal

   Height:

   127 mm

   Width:

   66 mm

   Depth:

   10.7 mm +1.9 mm versus Redmi Note 9 Pro Max

   Weight:

   Unknown

2. 2. Redmi Note 9 Pro Max

   Height:

   165.5 mm +38.5 mm versus s4009 Crystal

   Width:

   76.7 mm +10.7 mm versus s4009 Crystal

   Depth:

   8.8 mm

   Weight:

   209 g

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

1. 1. s4009 Crystal

   Screen diagonal:

   4 in

   Aspect ratio (height:width):

   5:3

   Approximate rectangular screen area:

   45.5 cm²

2. 2. Redmi Note 9 Pro Max

   Screen diagonal:

   6.67 in

   Aspect ratio (height:width):

   20:9

   Approximate rectangular screen area:

   107.4 cm²

Redmi Note 9 Pro Max has approximately 135.9% more rectangular screen area than s4009 Crystal.

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

Battery capacity

Capacity is not battery life. No endurance test is implied.

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.