Caller ID module is a special offer to some of our customers who has their private plastic tooling and want to built in the caller ID function. So, if you want to make a new caller ID tooling or to add the caller ID function into your existing telephone set, answering machine or other communication device, contact us for more detailed. There are also many caller ID systems are designed in our caller ID module, including FSK, DTMF, ETSI... etc. Besides the standard sizes, we also accept the customer's private specification.