Watch/calculator batteries silver oxide - button cell 52 mah to 1.3 volt - no mercury
Designed for use on continuous low drain. Replaces 399, SR27SW/W, TR927W; Duracell D395, Maxell SR927SW, Panasonic SP395, Sony SR927SW, Timex LA, Toshiba SR927SW, and Varta V395. 9.5mm diameter x 2.7mm height. 1.55 volt, carded.