LilyPad is the new Arduino based platform developed for Wearable Technology but there are no limits to how useful this LilyPad Coin Cell Battery Holder is for any project requiring a CR2032 or equivalent battery! These LilyPad Coin Cell Battery Holders have a small slide switch installed on the board, in-line with the power so you can shut off your project and save batteries. These boards each hold a 20mm coin cell battery (such as a CR2032) and gives you 4 connection points (two positive and two negative) for sewing or soldering into your project. Look for these LilyPad Boards to make your project complete: LilyPad Temperature Sensor (Search ASIN X001F5B7EX ) - Sense and take action based on ambient temperature LilyPad Pixel Board (Search ASIN B01GQCJI1M ) - Add programmable lights to your project! LilyPad Light Sensor Module (Search ASIN B01GK0Z4SQ) - Detect and react to changing light conditions! LilyPad Tri-Color LED (Search ASIN B01GIOHRZ2 ) A single LED that can be programmed to be any color! LilyPad Buzzer Board Module (Search ASIN B01GIN52O6 ) - Add a buzzer to your project! LilyPad Accelerometer (Search ASIN B01GIIC1J0 ) - Detect and respond to movement across the X,Y and Z Axis. LilyPad Button Switch (Search ASIN B01GBOS910 ) - Add a momentary switch - press, power is on! LilyPad Coin Cell Battery Holder (Search ASIN B01BYGAY90 ) - Battery holder with switch for your project. LilyPad Conductive Thread (Search ASIN B01CAY55O4) - Conductive thread to wire the components together. LilyPad ATmega32u4 (Search ASIN B01BK18VPI ) - What makes them all work!