Check out this ID Scanner Bar
Its a Handspring Visor PDA running the Palm OS 3.5 with a magnetic card reader. The handspring line of PDA was created by Jeff Hawkins and Donna Dubinsky. Jeff was a founder of Palm.
1992: Jeff Hawkins founds Palm Computing Inc.
1998: Jeff Hawkins and Donna Dubinsky found Handspring Inc.
1999: Company ships Visor and the first Springboard modules.
2001: First third-generation Visor is shipped.
2002: Company ships the first Treo, a combination mobile phone and PDA.
And states they will eventually stop making Visors. So after convincing dozens of developers to make products for the Handspring Springboard expansion slot, they left the market!!
Below is the ID scanner in a bar code reader cradle
This PDA had all the peripherals wrapped around it.