ELPA Antibacterial TV Remote Control for Hitachi RC-KS310HI ● Operates main functions of terrestrial digital broadcasts ● Equipped with 2-way LED for wide-angle transmission Operating distance: Approximately 7m (varies depending on the device and room conditions). Power supply: AAA batteries x 2 (sold separately). Battery life: Approximately 12 months (when using alkaline batteries) * Battery life may be shorter depending on battery performance and usage conditions. External dimensions (approx.): Width 51 x Height 227 x Depth 19 (mm). Weight: Approximately 96g (excluding batteries). I was using it normally until recently. Thank you.