DBK Wireless Infrared Remote Control for Sony A100 A200 A230 A330 A350 A700 A900 Instant or 2-second shutter release delay Allows for shutter release up to 16 feet,makes group photos easy Eliminates vibrations caused by physically pressing the shutter release. CR2025 battery included and replaceable,typical Battery Life - up to 2 years, 10,000 exposures 3 years warranty