cr88The frequency-agile Concert 88 Handheld allows for up to 16 systems to operate simultaneously (region dependent) with up to 300' separating the receiver and transmitter. AtCR88, ATHSP90.5, ATHSP90C, EMB1956, EMBRYO DEFECTIVE 1956, HEAT SHOCK PROTEIN 88.1, HEAT SHOCK PROTEIN 90.5, HSP88.1, HSP90.5, HSP90C: Background: