The TapNSet-Pro chess clock is unlike any other clock on the market. First clock available in the market with dual (double sided) display to allow spectators to see the time from both sides of the clock. It can be programmed using an app on your cellphone - you just tap your phone against the clock. It can also be programmed manually, just like the ZMF-II or ZMF-Pro clocks.DESCRIPTIONThe TapNSet-Pro chess clock is unlike any other clock on the market. It can be programmed using an app on your cellphone - you just tap your phone against the clock. It can also be programmed manually, just like the ZMF-II or ZMF-Pro clocks. These clocks were designed and engineered by avid chess players in the USA. In addition to Chess, this clock can be used for virtually every competitive two-player board game including Backgammon, Checkers, Scrabble, Shogi, Byo-Yomi, Go, and more. Some of the key features of this TapNSet-Pro clock are: DESIGNED AND ASSEMBLED IN THE USA!; First clock available in the market with dual (double sided) display to allow spectators to see the time from both sides of the clock.; Comes with magnetic cover to block one of the displays (if necessary in a tournament setting). Can be connected to the HOS Sensor board (sold separately, connection cable provided with sensory board). Stainless steel touch sensing buttons.; Programmable via cellphone app; set time controls (available for iOS and Android devices that support Near Field (NFC) Communication), and tap the phone against the clock before starting it.; Very easy to program menus.; Delay, Increment, Hour-glass, and Scrabble programmable between 1 and 40 minutes (New Feature) timing modes.; Delay can be displayed in three different modes.; Programmable tournament modes with and without move counter. Three time controls available.; Three different preset settings/modes can be kept in memory at all times.; Toggleable Sound and LED indicators.; Low power consumption. Batteries should provide power for more than 900 hours of use under normal conditions (compare to 600 hours of use that other clocks offer).; Durable painted metal enclosure to protect your clock; Patent pending.; 3 AA batteries included.; Size: 7.5 in x 4.6 in x 2.5 in;.