The second series of the next-generation technology G-Shock Bluetooth® v4.0 watches are capable of two-way operability with a smartphone. The GBX6900B supports Bluetooth® v4.0 with low energy wireless technology enabling pairing with a smartphone to control a smartphone music player from the watch, or adjust watch settings from a smartphone. This new timepiece adds to the previous notification features, by offering richer, two-way operability with a smartphone, for improved usability. A button on the watch can be used to operate smartphone applications, and a paired smartphone can be used to set features on the watch, such as the alarm, Countdown Timer and World Time. The GB-X6900B has a big watchcase to emphasize toughness, also influenced by the design of the DW-6900, and is still holding its outstanding features such as shock resistance and 200M water resistance. It also offers a semi-gloss black resin band digital Bluetooth watch with blue and neutral face.