Smart Band Health Monitor with ECG PPG

[Format] Professional e-commerce product main image, square 1:1, medical-grade smartband advertising style. [Colors] A deep navy background #101b3d with a faint honeycomb texture across the ground and a cyan glow behind the product; a black band with a rainbow-bright curved screen; purple pills with white icons; white type. No frame border. [Layout] A two-line headline across the top with an outlined sub-strip beneath; the band hero sweeps diagonally through the centre; four feature pills stack down the left edge. [Subject] A slim black smart band with an elongated curved display showing overlapping app cards labelled "Heart", "Exercise" and "Pedometer" in vivid gradient colours, its textured black strap wrapping back with a silver sensor button and a soft cyan edge light tracing the strap's curve. No people. [Headline] Top, giant white heavy caps: "Blood-pressure and heart-rate smart band"; beneath, a white outlined strip with cyan text: "PPG + ECG dual-core sensing for sharper data". [Badges] Left edge, four purple rounded pills with icons and white text: "Heart-rate monitoring", "Blood-pressure monitoring", "Temperature monitoring" and "Step counting". [Mood] Technical, health-focused and high-spec; navy honeycomb depth with a glowing colour screen and purple icon pills, clinical-tech confidence.