Coupon-eligible converter box or CECB is a specification for digital television adapters that were eligible to receive subsidy "coupons" through the United States federally-sponsored digital television converter box program. This program was put into place in order to provide over-the-air TV viewers with an affordable means with which to continue to receive free digital over-the-air television services after the digital transition was completed. The specification was developed by the National Telecommunications and Information Administration, with input from the broadcast and consumer electronics industries, as well as public interest groups.

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