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Mark I can confirm Gary's comments about the Chailey device. I have seen it demonstrated and was very impressed with its capability and flexibility. It is designed as a small (10 x 10cms) add on unit, able to be positioned under the foot plates of most wheelchairs. Using ultrasonics in the forward direction, it has a transmitter / reciever scanning at 50 cps.(approx). Additional infra red proximity detectors are mounted, one to each side of the chair( 2 x 5 cms). Signals are fed to ADC / microcontroller circuitry whose software undertakes data conversion for distance, makes programmed decisions on the data, and communicates via the DX serial bus system whether to slow or stop the wheelchair. The unit can be manually programmed, using switches on a rear mounted module for various levels of system intervention, dependent on the skills of the W/C driver.Thus stand off, slow to a soft bump, hard bump etc. can aid in the training for users.I have also seen it at Kings Rehab Unit at Crystal Palace where it is being trialed. As I understand it, the unit has been under development for three years and is undergoing extensive clinical trails. It is not on the market yet! Richard Taylor MIEE Rehab. Engineer Shaftesbury Education 12 Lyndsay Rd Branksome Park Poole, Dorset. BH13 6AS email: [log in to unmask] _______________________________________________ Scanned for all known viruses by Bucks Net in association with NetCleanse. Please consult http://www.bucks.net/av/ for more information. _______________________________________________ Scanned for all known viruses by Bucks Net in association with NetCleanse. Please consult http://www.bucks.net/av/ for more information.