Optimum Online Boost Plus available only with a subscription to Optimum Online for an additional $14.95 per month. Minimum system requirements and configurations apply. Free-to-use modem is the property of Optimum and must be returned in good working order. Lost, stolen, unreturned, or damaged equipment is subject to a non-return fee. Many factors affect speed. Actual speeds may vary and are not guaranteed. Other restrictions apply. Where available.