Motorola have invested in a French startup that uses acoustic feedback to mimic traditional touch and multitouch input. Sensitive Object use acoustics in their ReverSys system to "analyze sound waves departing from the point of a touch to precisely and cost-effectively transform any product into a touch device." For example, the system could track points of contact across the entire body of a cellphone, without requiring expensive capacitive sensors to cover the device.
ReverSys is also said to be cheaper to implement than traditional resistive, capacitive or optical touchscreen technology, which would mean that Motorola could implement it in entry-level devices. The firm is now working on full 3D device tactilization. No details as to the level of financial investment have been revealed.