Must have product for amateur and professional photographers. Great for self-portraits, group pictures as well as difficult to approach subject. Two-level shutter button, autofocus, continuous drive & bulb mode. Prevents shaking for high quality photos. Free AC charger included with purchase. Control distance: 328 feet (100 meters). The WR-100F Compatible with Sony/ KonicaMinolta Sony DSLR-A100 DSLR-A100K KonicaMinolta Maxxum 7D Maxxum 5D Dynax 7D Dynax 5D Maxxum 9 Maxxum 7 Maxxum 4 Maxxum 3 Dynax 9 Dynax 7 Dynax 4 Dynax 3 Maxxum 807si Maxxum 700si Maxxum 600si Maxxum 505si Maxxum 500si Dynax 505si Dynax 500si Dynax Sweets Maxxum 9000 Maxxum 7000 Maxxum 5000 Dynax 9000 Maxxum 800si Dynax 807si Dynax 800si Dynax 600si Dynax 7000 Dynax 5000 DiMAGE 7Hi Dynax 700si DiMAGE 7 DiMAGE 5 DiMAGE A1 DiMAGE A2 DiMAGE A200 DiMAGE 7i Dynax Sweet Maxxum Sweets.