Clocking in and out is simple — just hold the badge for a moment in front of the T32xx and it reads automatically. Smart Card technology reads through non-metallic items, enabling the card to be used while inside a wallet or purse without harming credit cards. As there is no physical contact between the card and reader, neither will become worn-out by continuous use or are affected by dust or residue from the working environment — unlike swipe readers. The cards' passive electronics mean that they do not require batteries and have a theoretical infinite life. The cards have a durable, wipe clean plastic shell.