Function: Interactive device, Fitness equipment, voice intercom, , Learning helper, Network Time Synchronization Application: Clock, ID card, Counter, Memory game, Short-range communication, Sports management, Compass Diverse wearables: Watch type, Waistband type, Ornaments Lithium battery: capacity, long battery life, Rechargeable Programming platform: Graphic programmer, Python language programmer Onboard Clock chip, accurate time Onboard Audio Module, Play sound files, recording and playback Colour:blue Material:plastic Package Contents: 1 x K-Watch expansion board 1 x : bit expansion board 1 x Watch strap 1 x Waist strap 1 x Screwpack+screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.