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How to Use: Install 1x CR2032 button cell battery into each control box Lace up your shoes with these 2 shoelaces Insert the top of each lace into the 2 holes of the control box, switch the lock to "lock" mode Push the white button in turn to control the lights: on/flash/strobe/off Specifications: Light source: LED Power: 2 * CR2032 button battery (included). Modes: Long light/fast flash/slow flash Shoelace material: Glass fiber Control box material: ABS Length: Approx. 80cm Each shoelace use a CR2032 coin cell battery. Under the long bright circumstances continuous discharge 30 hours, flashing or intermittent discharge is 60-80 hours, normal use 2-3 months, you can replace the battery yourself.