The new Smart Sock 3 Extension Pack works with your existing Smart Sock 3 sensor and includes our toddler-sized fabric sock.

Track your child’s heart rate, oxygen level, and sleep trends for 42 additional months for continued peace of mind.

• Track heart rate, oxygen level & sleep trends
• Access to 42 additional months of live readings
• Tailored monitoring technology as your child grows
• Large fabric sock works with Smart Sock 3 sensor

For children approximately 13.5 to 25 kg.

INCLUDES: Two large fabric socks in Mint.