Tech Logic

The iPhone Fitness app is often accurate for steps and distance; calorie burn and exercise minutes vary without calibration and clean signals.

AirTag location is within a few feet with Precision Finding nearby; over distance it depends on the Find My network, so accuracy and timing vary.

Renpho scale accuracy: weight is close for daily use; body fat is an estimate that can be off by several points.

Oura Ring accuracy is strong for resting heart rate and total sleep time; sleep stages and steps are close, but not lab-grade.

Binoculars are rated by magnification × objective lens size (e.g., 8×42), plus field of view, eye relief, prism design, and coating quality.

Apple Trade-In lets you swap an eligible device for instant credit or an Apple Gift Card after a quick online or in-store evaluation.

Apple Cash lets you send, spend, and transfer money in Wallet using a debit-funded balance, Messages, and Apple Pay at stores and online.

Wi-Fi extenders work by receiving your router’s signal and rebroadcasting it to create a second hotspot that fills weak or dead zones.

VPNs work by encrypting your data and routing it through a secure server, hiding your IP so websites and networks see the server instead.

Each iPhone moves from mined materials to precision parts, then final assembly, testing, and packaging across a global production chain.