G-SHOCK Bluetooth GB-6900B-1BJF This is the CASIO Bluetooth Watch G-Shock GB-6900B. GB-6900B-1BJF From G-SHOCK, which continues to evolve in pursuit of toughness, comes a next-generation G-SHOCK that supports BluetoothRv4.0 (BluetoothR low energy technology ※1) and links with smartphones. Using the "G-SHOCK+" application downloaded to your smartphone, you can control your smartphone's music with the G-SHOCK's buttons, and change various settings such as alarms and notification methods on the G-SHOCK from your smartphone. It also has functions that take advantage of the communication features. You can also enjoy the expansion of usable functions with application version upgrades. External dimensions: approx. 50.0(W) x 18.7(D) x 53.2(H) mm Weight: approx. 65g World Time Stopwatch Timer Alarm Mobile Link function: Function linkage using wireless communication via Bluetooth® v4.0 LED backlight Body only. Please check the images for details. Operation...Good