Pentax IST DS2 - Manual (Page 197)

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Specifications for Remote Control F (Optional)
Remote Control
Infrared Remote Control unit, captured about three seconds
after remote control shutter button is pressed or immediate
capture on pressing the button, operating distance = within
approx. 5 m in front of the camera.
Power One lithium battery (CR1620)
Dimensions 22 mm (W) × 53 mm (H) × 6.5 mm (D)
Weight 7 g (including battery)