2 Battery Holder - Each Holds 1 Single Coin Battery (CR2032 or similar) 4 Connection Points (2 +, 2 -) - Use Solder or Conductive Thread Integrated On Off Switch Use for Wearable Devices, Textile based computers, Robotics, 3D Printer Projects Also available individually Is the Arduino based platform developed for Wearable Technology but there are no limits to how useful this Coin Cell Battery Holder is for any project requiring a CR2032 or equivalent battery! These 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. Material: Metal Color Purple Package Contents: 4 x Coin Cell Battery Holder