Golden Security micro-computer intelligent control Wireless Indoor Siren with strobe GS-SS07A Loud alarming sound. It can be regarded as a voice magnifier, which alert with about 100db volume. For example, if the alarm goes off, the main unit will alarm and this SS07A will alarm loudly at the same time. So you can hear it from a far distance and take action accordingly. Stable transmission. It can respond to the main panel for about 100 meters in an open area and the transmission is sable and reliable. Wireless design. Theres not so much wired lines in your house that make your house neat in condition. Easy to use. If the SS07A has been paired with the main panel, you just need to plug in and use it. Note: This SS07A siren can only work with Golden Security home alarm system and it should be learned as a device.