Mark, In the instructions that come with the stimulator it tells how to use an AM radio to determine if the unit is turned on or shut off. It is not a fool-proof procedure because it depends on the particular frequency that the simulators are set at ---- but most settings are clearly detectable with the radio method. A really small, cheap radio (boom box style) from someplace like WalMart works the best. The newer units being tested (not in US yet) will come with a handheld control that will give you the information about the unit and allow the patient to adjust the unit within parameters set by the physician. Paul ----- Original Message ----- From: Mark Steiner <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, July 26, 2000 9:14 AM Subject: one more DBS experience . also informed there is no way to detect whether the unit is on or off at home!--somethng which needs to be corrected as it can be inadvertently triggered