Plaintiff, a grocery store, contracted with Defendant, a burglar alarm company, for Defendant to send guards to Plaintiff's premises and to notify the local police if the alarm was activated. The contract had this language: It is agreed that the Contractor is not an insurer, that the payments here are based solely on the value of the service in the maintenance of the system described, Chapter 16 Remedies 16.7 Summary and Exercises 629 that it is impracticable and extremely difficult to fix the actual damages, if any, which may proximately result from a failure to perform its services, and in case of failure to perform such services and a resulting loss, its liability shall be limited to $500 as liquidated damages, and not as a penalty, and this liability shall be exclusive.