[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Input](./puppeteer.protocol.input.md) > [TouchPoint](./puppeteer.protocol.input.touchpoint.md) > [id](./puppeteer.protocol.input.touchpoint.id.md) ## Protocol.Input.TouchPoint.id property Identifier used to track touch sources between events, must be unique within an event. Signature: ```typescript id?: number; ```