The response device is the "transaction" component of your mail-out pack. It is simply the means by which those receiving your mail can reply to you. Some examples of response methods include Reply Paid envelopes, fax, e-mail and in-store.

The easier it is to respond, the more likely your customers are to do so. Therefore, if your mail-out is about attracting a response, then the response method needs to be simple. You also need to actively encourage a response by using devices such as competition entry forms or offering discount vouchers.