🏷️ Basic Information Identification Make: Casio Model: SF-7900 Digital Diary Year: 1994 Generation: N/A 📋 Manual Details Description Manual Type: Service Manual + Parts List Language: English Format: PDF Download Content Covered Procedures: Repairing, Servicing, Rebuilding, Maintenance ⚙️ Engine Specifications General Engine Type: N/A (Electronic Device) Power Power Source: Battery Operated 🔧 Transmission General Type: N/A (Electronic Device) 📐 Dimensions Physical Length: 158 mm Width: 80 mm Height: 13 mm Weight: Approx. 160g (including batteries) 🔧 Maintenance Battery Replacement Battery Type: CR2032 x 1 Cleaning Cleaning Instructions: Wipe with a soft, dry cloth. Avoid solvents or abrasives. 📄 Features Display Display Type: LCD (Liquid Crystal Display) Memory Memory Capacity: Approx. 1000 characters Functions Core Functions: Calendar, Schedule, Memo, To-Do List, World Time, Alarm Interface Keyboard Type: QWERTY Power Management Auto Power Off: Yes 📄 Technical Data Display Resolution Display Resolution: N/A (Text-based LCD) Connectivity Connectivity Options: N/A (Standalone Device)