8.5-inch LCD electronic memo pad, convenient with a dedicated pen. - Model Name: HDMPAD58BK-RX - Size: 8.5 inches - Type: Electronic memo pad - Battery Type: CR2025 - Included: Dedicated pen The pen can be stored on the memo pad. It's thin and lightweight. The battery is only a test battery, so it's ready to use immediately. You can erase by sliding the lock mark to the left. I opened the package to check the contents. I purchased it last December. Please understand that it has been stored at home. Thank you for looking.