Most include parental-control or companion phone apps to set approved contacts and limits, GPS location and geo-fencing (safety-zone) alerts, an SOS/emergency button to call guardians, and modes such as school mode to reduce distractions.
Common options are Bluetooth and Wi‑Fi. Some models offer cellular (3G/4G/LTE) with a preinstalled SIM—these typically require a subscription for full phone/data features. Many watches also use USB for charging or data transfer.
Many are labeled "water-resistant," "sweat-resistant," or "splash-proof/splash-resistant." A smaller number specify formal ratings (for example, at least one listing notes an IP68 rating).
Common sensors include accelerometers and gyroscopes, with many models offering step counters/pedometers. Some watches add heart-rate monitoring and built-in GPS; a few specifically list activity tracking for running, cycling or swimming.
Most packages include a charging cable and user manual. Some also include SIM cards, wall chargers or extra wristbands, and a few bundles add extras like Bluetooth headphones.