Warehouse staff at Argos are going on strike later this month following a row over hundreds of workers being moved to Northamptonshire.
Nearly 500 people were transferred from the company's distribution hub in Leicestershire to Kettering.
Members of the 'Unite' union will walk out at five sites across the country, including the Basildon depot in Essex, on August 15.
The action's due to last three weeks.
'Unite' says it's taken the step because it wants guarantees that workers’ future terms and conditions will be safeguarded.
'Unite' has warned that the strike will affect deliveries, but this has been denied by Argos.
"We're disappointed with the union's actions, which are based on unreasonable demands and are wholly unnecessary," a spokesman said.
"Customers can be reassured that we have full contingency plans in place to ensure there will be no disruption to deliveries."