MultiLog Main Features:

• Altitude data logging with 10Hz speed rate and 0.1m resolution.
• F5X Altitude Limiting with selectable cut-off altitude and time.
• True PPM measurement and loggin PPM_IN and PPM_OUT data with 10Hz speed rate.
• Low power and high capacity Flash memory onboard(instead of very low capacity EEPROMs or high-power and heavy SD cards from over Logger vendors).
• Light weight  – not more than 5 grams – .176 oz.(complete weight with wire and connector).
• Small size 45 X 17 X 7 mm
• Hight-speed PC interface – 921600 baud
• very little current consumption(typicaly lower than 10mA)
• MultiLog USB Interface can replace  ” HP-AT-PRGUSB Hyperion 3-Pin USB <> Serial Adapter for all Atlas Servos”
• 2 Led(Green+Red) and sound status notification

UltraLight Main Features:

• Generaly the same functionality as MultiLog without F5X Altitude Limiting features and capability of external sensors connecting
• ULTRA Light weight  – not more than 2 grams – .07 oz.(complete weight with wire and connector).
• ULTRA Small size 25 X 12 X 6 mm

Full description available here