The trolley is made of robust, scratch-resistant polycarbonate with a metallic look and is manufactured in flames. The trolley system features an aluminum handle and interior compartments, enhanced visually with leather inserts. The Ultra Slim hard-shell trolley from Piquadro in medium size has four wheels, a double tube, and retractable handles. It is equipped with a TSA lock and an address tag. The Smart Tracker operates via the Connequ app, which is available for both smartphones and smartwatches. All available functions can be controlled through this app. The bags and trolleys from Piquadro can: - communicate with a smartphone/smartwatch via this app (via Bluetooth), - alert when the bag/trolley is left behind by activating the ringtone on the smartphone or causing the smartwatch to vibrate, - charge a smartphone or tablet through a built-in battery in the bag or trolley, - transmit weight to the app via a special Bluetooth scale in the trolley handle, - open and close the trolley's Bluetooth TSA lock, - alert when the charge of the built-in power bank in the bags is running low, - turn on the LEDs in backpacks equipped with rear lights by touching the smartphone or smartwatch.