This bubble chart compares mobile phone brands by battery life, price, and units sold. The x-axis shows battery hours, the y-axis shows price in USD, and the circle size encodes units sold. Each brand is color-coded using `d3.schemeSet3`. The visualization uses D3.js v7 with SVG rendering and includes interactive tooltips on hover. Data is loaded from a CSV file using `d3.csv`, with scales created via `d3.scaleLinear` and `d3.scaleSqrt`. A legend identifies each brand's color.