Introducing the Honeywell Home K14139 Security Device Backup Battery, designed specifically for the iGSMHS4G GSM Communicator. This reliable lead-acid battery ensures your security system remains powered through a controlled energy reaction, providing you with uninterrupted protection. Its unique battery size maximizes efficiency and dependability, making it an essential spare for your device. With a safe 6V DC output, you can trust this battery to keep your security device operational. Don't compromise on safety—ensure your peace of mind with the Honeywell Home K14139 Backup Battery. Order yours today and safeguard your home!