SAFE USE GUIDE
• Rear-Facing: 5–50 lb (2.3–22.7 kg) and whose height
is between 18–44 in. (46–112 cm)
• Forward-Facing: 22–65 lb (10–29.5 kg) and whose
height is between 30–57 in. (76–145 cm)
• Booster: 40–120 lb (18–54 kg) and whose height is
between 40–57 in. (101–145 cm).
• Infants who weigh less than 22 lb (10 kg) and are under
1 year old, MUST use this child restraint rear-facing.
For newborn infants, you must consult the infant's
doctor before using this child restraint. A newborn
infant may have difficulty breathing or have other
medical problems when placed in a seated position.
Before installing this child restraint in a vehicle, be
sure to also check the vehicle owner's manual for
information on proper installation.
Check all installation configurations before discarding the
box. Diono cannot guarantee proper fit in all vehicles.
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radian 3RX
DO NOT
place this child restraint rear-facing in
a vehicle seating location with an active front air
bag.
Choose the proper child restraint belt path
1. REAR-FACING SECTION
2. FORWARD-FACING SECTION
3. BOOSTER MODE SECTION
5 lb
22 lb
40 lb
(2.3 kg)
(10 kg)
(18 kg)
Rear-Facing with 5-Point Harness
US: 5–22 lb (2.3–10 kg) MUST be Rear-Facing
22–50 lb (10–22.7 kg) CAN be Rear-Facing
CA: 2.3–22.7 kg (5–50 lb) Rear-Facing
Forward-Facing with 5-Point Harness
22–40 lb (10–18 kg) WITH SafeStop Only
40–65 lb (18–29.5 kg) WITHOUT SafeStop
Booster Mode with Lap/Shoulder ONLY
40–120 lb (18–54 kg)
diono.com
SAFE USE CHECKLIST
50 lb
65 lb
120 lb
(22.7 kg)
(29.5 kg)
(54 kg)
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