Symbol Technologies and Telxon were operating radio networks in the 2.4 GHz ISM bands. IEEE 802.11 was not yet ratified, so Symbol and Telxon were free to define competing standards of communication at this frequency band. Symbol settled on frequency hopping as the most robust, agile and interference-tolerant approach to data communications while Telxon selected direct sequence technology which they felt afforded higher transfer speeds with adequate interference immunity.
Kroger ordered a head-to-head comparison test. Ultimately and not decisively, Kroger chose Telxon. At about the same time, the IEEE decided to adopt the direct sequence approach in its IEEE 802.11b standard.