The UB-03 has the size of a coin and is attached to the bridge with double sided adhesive tape.
Mode: passive or active
The construction of this new model from Schatten is similar to the old Polytone: the piezo is wedged between the bridge legs by means of a thread. A second sensor is attached to the bridge with double-sided adhesive tape. Schatten offers a passive and an active version (with battery powered preamp) of this pickup system.