There are times when conventional communications are either ineffective or detract from the element of surprise. Novitac has designed  a communications wristband that the company markets as FEELTACT  which uses a Bluetooth link to your smartphone to receive or send silent messages, from or to command and control or from other bracelets in your team. There is no audible input or output, the FEELTACT vibrates providing only tactile feedback. An entry “GO” decision for example could be communicated by vibrating the bracelet. The user can transmit up to four different messages and supports development of team dependent codes.