This is the compact and easy-to-wear G-STEEL GST-B600A-1A6JF, featuring Bluetooth and solar power! I purchased it new and used it about once every two weeks. Since I didn't use it often, it's practically in new condition, but please consider it as used. Feel free to ask any questions in the comments. Accessories: Outer box has some damage. Instruction manual. Product Description: The GST-B600 series is the thinnest and smallest case in G-STEEL history. [Shock Resistant & 20-Bar Water Resistance] Features a shock-resistant structure that protects against impacts and vibrations. It also has 20-bar water resistance, allowing for use in various locations and situations. [Tough Solar] Casio's unique solar charging system combines a solar panel that generates power from even the slightest light with a large-capacity secondary battery, enabling stable operation of various functions that require heavy loads. [Mobile Link Function] Function linkage via Bluetooth® communication with a compatible smartphone. ● Shock-resistant structure ● Tough Solar (solar charging system) ● 20-bar water resistance ● Mobile Link function (function linkage via Bluetooth® communication with compatible mobile phones) ● Hand-retraction function (When the hands overlap the LCD display and are difficult to see, the hands can be temporarily retracted from above the LCD display) ● World time: Displays the time of 38 cities (38 time zones, with automatic summer time setting) + UTC (Coordinated Universal Time), city change function for home time ● Stopwatch (1 second, 60-minute counter, with lap/split) ● Timer (set unit: 1 second, maximum set: 60 minutes, measured in 1-second increments) ● 5 daily alarms, hourly time signal ● Battery charge warning function ● Power saving function (display turns off to save power when left in the dark for a certain period) ● Full auto-calendar ● 12/24-hour format switching ● Button operation tone ON/OFF switching function ● Date display (month/day display switching) ● Day of the week display (switchable between 6 languages: English, Spanish, French, German, Italian, and Russian) ● Double LED light: LED light for the face (Super Illuminator, afterglow function, afterglow time switching (1.5 seconds/3 seconds)), LED backlight for the LCD part (Super Illuminator, afterglow function, afterglow time switching (1.5 seconds/3 seconds)) ● Operating time from full charge without solar power: Approximately 7 months Power saving state: Approximately 18 months * When not linked with a smartphone, the normal quartz accuracy is ±15 seconds per month.