The Smash bracelet by founder Rob Crowder has been made specifically for advanced tennis players, as well as for those who are looking to hone in on their on-court performance.
Smash works much like a virtual coach. If worn during games, the mobile device will in turn relay data on technique and specific plays. The entirety of the set is thus monitored, much as one would expect from a trainer.
In addition to the critique of one's swing, Smash also offers up information on how one can improve his/her tennis tactics. The advice is offered via an accompanying smartphone app, making the system easy to use while at any basic athletic facility.
Currently, Smash is launching a Kickstarter campaign in hopes of raising target funds.