Color will change automatically in seven different colors. Very beautiful Battery is included. Battery is LR44 and can be replaced. Battery can last for 24hrs at good brightness, and last for more than a week. selling for $1.50 each. More than 20pcs $1.40 each More than 50pcs $1.30 each More than 100pcs $1.20 each Meet up available for 10pcs and above, else item will be sent through postage.Self collection at my block at tampines street 34 or tampines mrt(above 20pcs) on weekends.Delivery is available but at $15-$30 depending on location See below for video. View here for rainbow lights(popular choice)😊 http://youtu.be/sSfZjMR_czE View here for fast flickering rainbow lights https://youtu.be/F-DEy_mRZ7w Red light with red casing is available http://youtu.be/urfYFebwrb4 Red,blue and Yellow flickering light options available too(fixed light but will flicker) http://youtu.be/mRVxSUistzs Non-changing(fixed light wont flicker) colors are available for pink and white http://youtu.be/3vmif9Xaz7Q Contact 96215394 for fast deal!