When you purchase a new Philips Holter system, you can rest assured that your system will never become obsolete. The Philips Holter system is sold with a USB Hardlock key that acts as a seat license. About every 12 months, Philips releases a new software revision that can be purchased for under $500 that updates your Holter software with the latest features.  All new software upgrades are always backward compatible so that you never end up with obsolete recorders.