Yaheetech Mini Foldable Digital LCD Calendar Temperature Display Snooze Alarm Clock Special multi-function mini design, ultra compact and lightweight 12/24 hours format option Power Supply: 1 X CR2025 (3 V) button cell (not included) Material: plastic and silver-plated ; Color: white Approx. Size: 9.5cm x 8.5cm x 2cm/3.7 x 3.3 x 0.8".