Deca BDE is used as enclosures made of polystyrene for TVs, and computer equipment. It is also used in cables and wires, connectors, switches, and other internal plastic components.

EPA: it is toxic!
Some claim that there is no evidence that deca BDE is toxic. Many firms are nevertheless voluntarily phasing it out in the US Environmental Protection Agency’s campaign aiming at limiting the production, importation and sales of deca BDE in the country.  The agency quotes scientific findings that indicate that deca BDE persists in the environment, may cause cancer or impact brain function. It can also degrade to more toxic chemicals that are hazardous to wildlife.

The rapid development of new, polymer-based technology and other phosphorus or mineral-based substitutes to deca BDE and other flame retardants enforces this drive to start getting rid of the substance.

Belongs to a regulated group of ethers
Deca BDE belongs to the group of polybrominated diphenyl ethers (used as flame retardants) and is regulated by China RoHS.

Polybrominated diphenyl ethers are affected by legislation like RoHS in the EU, Japan, China and Korea, WEEE, Japan RoHS and California’s Prop 65.

Sources
Commercially Available Halogen free Alternatives to Halogen-Containing Flame Retardant Systems in Polymers
Deca-BDE and Alternatives in Electrical and Electronic Equipment
Press releases from Albemarle and Chemtura etc.
Wikipedia