This big set contains 15 LEDs (3 Yellow, 3 Orange, 3 Red) and a double dual (big sized) Breadboard, a Battery Holder (2x AAA) with a on/off Switch implanted in it, a tactile switch,a 3cm wire and foam tape. You can add a lot more stuff to it to make different effects. There really isn’t a proper use for it because it was just a fun set for beginners with breadboard but it can be used as a lamp because the LEDs are rather bright especially in the dark. There will be future breadboard sets more complicated and useful than this. Instructions contained within the set. Price: 48RMB.