The Companys revenue transactions consist predominately of sales of products to customers. Product revenues are generally recognized in the period in which persuasive evidence of an arrangement exists, title and risk of loss have passed to the customer, generally upon shipment, the price is fixed or determinable, and collectability is reasonably assured. At the time revenue is recognized, the Company establishes an accrual for estimated warranty expenses associated with sales, recorded as a component of cost of revenues. The Company's standard warranty period usually covers 12 months from the date of sale, although it can be for longer periods for certain products. The Companys customers generally do not have return rights. However, the Company has established an allowance for estimated customer returns, based on historical experience, which is netted against revenue. Sales to certain distributors are made under agreements providing distributor price adjustments and rights of return under certain circumstances. Revenue and costs relating to sales to distributors with price protection and rights of return are deferred until products are sold by the distributors to end customers. Revenue recognition depends on notification from the distributor that product has been sold to the end customer. Also reported by the distributor are product resale price, quantity and end customer shipment information, as well as inventory on hand. Deferred revenue on shipments to distributors reflects the effects of distributor price adjustments and the amount of gross margin expected to be realized when distributors sell-through products purchased from the Company. Accounts receivable from distributors are recognized and inventory is relieved when title to inventories transfers, typically upon shipment from the Company at which point it has a legally enforceable right to collection under normal payment terms.