Redeemable 12/31/2010. Certificate equal to 3 hours of assistance, billed in quarter-hour increments. If on-site assistance is required, time begins from moment of technician's departure. On-site service only available to NYC, Queens or Brooklyn. If a purchase exceeds the amount listed on the gift certificate, the redeemer is responsible for paying the difference at time of purchase. A $5 shipping charge will be added to all items mailed.