A stored value card having increased theft prevention features. The device includes flexible panels, the panels being stretched over andor fixed to a support structure. Upon reception the transmission channel between the transmitting antennas and the receiving antennas is estimated. Both the location of the container and the number of tokens can be monitored and determined to thereby prevent any overflow of tokens. The island region may further have a third edge that extends in the second direction to connect the first and second edges. The Gram-negative bacterial strain is a short facultatively aerobic or micro-aerobic rod or an enteric strain including at least one pathogen selected from the group of: Salmonella, Escherichia, Yersinia, Klebsiella, Shigella, Enterobacter, Serratia, Pseudomonas, and Citrobacter.