Universal life insurance policies have cash values. Paid-in premiums increase their cash values; administrative and other costs reduce their cash values. Universal life insurance addresses the perceived disadvantages of whole life—namely that premiums and death benefits are fixed. With universal life, both the premiums and death benefit are flexible. With the exception of guaranteed-death-benefit universal life policies, universal life policies trade their greater flexibility off for fewer guarantees. “Flexible death benefit” means the policy owner can choose to decrease the death benefit. The death benefit can also be increased by the policy owner, usually requiring new underwriting. Another feature of flexible death benefit is the ability to choose option A or option B death benefits and to change those options over the course of the life of the insured. Option A is often referred to as a "level death benefit"; death benefits remain level for the life of the insured, and premiums are lower than policies with Option B death benefits, which pay the policy's cash value—i.e., a face amount plus earnings/interest. If the cash value grows over time, the death benefits do too. If the cash value declines, the death benefit also declines. Option B policies normally feature higher premiums than option A policies. The endowment policy is a life insurance contract designed to pay a lump sum after a specific term (on its 'maturity') or on death. Typical maturities are ten, fifteen or twenty years up to a certain age limit. Some policies also pay out in the case of critical illness. Policies are typically traditional with-profits or unit-linked (including those with unitized with-profits funds). Endowments can be cashed in early (or surrendered) and the holder then receives the surrender value which is determined by the insurance company depending on how long the policy has been running and how much has been paid into it. Accidental death insurance is a type of limited life insurance that is designed to cover the insured should they die as the result of an accident. “Accidents” run the gamut from abrasions to catastrophes but normally do not include deaths resulting from non-accident-related health problems or suicide. Because they only cover accidents, these policies are much less expensive than other life insurance policies. Such insurance can also be "accidental death and dismemberment insurance" or "AD&D". In an AD&D policy, benefits are available not only for accidental death but also for the loss of limbs or body functions such as sight and hearing.