Shipped from the UK.  Fully CAS algebraic calculator.
You can enter very complex expressions and check you have reached the correct answer.  You can then step through each part of your calculations and algebra to find errors.

Benefit of a screen double the size of the others, so as you can see in the pictures you can you can flip to landscape mode to see full results.  Also, unlike the others it is a touch screen so everything is menu driven. There is a stylus, but you can just as easily use a finger nail or toothpick.

Home printed manual included (A6 size so small print).  You can download a pdf from the web site if you prefer.

Easy connect to computer, mini USB, easy to upload any updates, has a CD with it but I didn't look at it.  All new cables as in box.  I presume there is some desktop software to go with it, there usually is and being from CASIO it will be well supported for many years to come.  Can use rechargeable batteries but doesn't do the recharge.  Bonus is you can replace normal AAA batteries anywhere  and won't have to replace a built in battery every few years.

I understand there are loads of games out there to download too!


Happy to post abroad but it will have to be tracked, unfortunately international tracked is not cheap.  Built in languages, Deutsh, English, Espanol, Francois, Suomi.  The free printed manual is English.

The official Casio description is here, and copied below;
https://www.casio-europe.com/euro/products/school-and-graphic-calculators/graphic-calculator/fx-cp400/

At a glance

Graphic calculator with Computer-Algebra-System and high resolution touch-color-display. The latest model of the ClassPad-series comes with an intuitive and easy to learn handling.

  • Large, high-resolution colour display with 4.8 inch screen and a resolution of 320 x 528 pixels
  • Sensitive touchscreen for finger or stylus operation
  • Pinch in/out (finger zoom)
  • Use of commercially available batteries ensures that exams run smoothly
  • Very fast start-up time
  • Intuitive operation with PC-like menu structure
  • Interactive linking of various application areas
  • Rotating screen in the main and graphics applications, as well as for spreadsheet calculations
  • Interactive differential calculus
  • 3D graph
  • Extensive German user navigation
  • Virtual keyboard
  • Updatable software
  • Connection to PC as as USB mass storage device

Technical Specifications

Display
  • Natural display: Natural V.P.A.M.
  • Colour: over 65,000 colors
  • Lines x positions: 16 x 25
  • Display size (in pixels): 528 x 320
  • Backlighting
  • Horizontal screen view
  • Touch screen and pen operation
  • Pinch in/out (finger zoom)

Memory
  • Available RAM/Flash ROM memory: 500kB/5,5 MB + 24MB
  • Value/constant memory: depending on memory capacity
  • Recall of last input

Basic mathematics
  • Scientific notation: 10+2
  • Sin, cos, tan, and inverse
  • Hyperbolic functions and inverse
  • Degree, radian and gradian conversion
  • Sexagesimal < > decimal conversion
  • Polar < > perpendicular conversion
  • Calculations to the power of n
  • Exponential and logarithmic functions
  • Value tables
  • Linear equation systems: depending on memory capacity
  • Higher-order polynomial equations: depending on memory capacity
  • Logical operators (AND/OR/etc.)
  • Computer algebra system
  • Complex number calculation
  • Interactive equation solver
  • Matrices
  • REF/RREF function
  • Vector analysis
  • Vector equations
  • Repeat/response memory
  • Recursive sequences
  • GCD and LCM function
  • Remainder calculation
  • Laplace transform
  • Fourier transform

Graphic representation
  • Number of rectangular functions: up to 100
  • Number of parametric functions: up to 100
  • Number of polar functions: up to 100
  • X=f(y) graph
  • Inequalities
  • Zoom, trace function
  • Conics mode
  • Dynamic geometry software
  • 3D graphics

Statistics
  • Mean value, standard deviation
  • Linear regression
  • Median, quartiles
  • Descriptive statistics
  • Combinatorics and permutation
  • Regression models: 10
  • Histograms, dispersion
  • Box and whisker plots
  • Pie chart/bar chart
  • Number of lists: depending on memory capacity
  • Max. list length: depending on memory capacity
  • Assessment statistics
  • Random number generator
  • Random integers
  • Chi-square, ANOVA, F-test
  • Z and T interval tests
  • Probability simulations
  • Probability distributions

Differential and integral calculus
  • Differential equations
  • Interactive differential calculus
  • Numerical integral calculus
  • Numerical differential calculus
  • Symbolic integral calculus
  • Symbolic differential calculus
  • Maximum, minimum

Programming
  • Formula memory
  • Programming/user-defined
  • String function

Financial mathematics
  • N, %, i, PV, PMT, FV
  • Amortisation
  • Conversion of percentage <> effective interest rate
  • Interest and compound interest calculation
  • Annuity maturity date
  • Day/date calculations
  • Loans
  • Depreciation
  • Investment evaluation
  • Cost/profit margin calculation

Other
  • Additional calculator applications/add-ins
  • Operating system updates available
  • Spreadsheet calculations
  • Physium application: Add-In
  • Image plot application
  • eActivity
  • Hard protective case
  • Computer-to-calculator cable: included
  • Automatic shut-off
  • PC connectivity available: included
  • Identical emulator software: optional
  • C-Lab connection possible / ECON
  • Main battery: 4 x AAA
  • Size (H x W x D mm): 21,1 x 89 x 206
  • Weight: 320 g