20pcs DS1900A iButton I-Button electronic key IB TM Watch Card Fobs w/ Bracelets

Description

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Product Description
Please tell me the color of
Wristbands/
Bracelets
you prefer after
make the order!
IButton TM watch card is a convenient and durable for intelligent TM worn on the wrist above the shaped card varieties.
It may also be used for access control, club members and staff management sign, sauna club membership card.
Features:
Shockproof
waterproof
resistant to high temperatures
closed-loop wrist strap
flexible
easy to wear
easy to use.
Application:
Library
Swimming pool
Sauna
Outdoor work
Bath center
Humid working environment, etc.
Key indicators:
ultrasonic encapsulation chip and coil
Material:
ABS/PVC
Protection Class: IP67
Suitable temperature: -25 to
7
0 ° C
Package：20pcs