Wireless Siren. Features: The Wireless Outdoor Siren Sounds 120dB Sound, with Flash, High Quality and Durable. It Does Not Work Alone, It Must Be Used in Conjunction with a Home Alarm System. In the Event of an Intrusion, the Alarm System Will Send an RF Signal to It, and the Alarm Will Emit a High-decibel Sound to Block the Intruder. It Uses Micro-technical Control Circuitry to Ensure High Accuracy and Reliability. It Can Be Widely Used in Shops, Warehouses, Offices, Homes, Etc. Specifications: Material: ABS Plastics Power Input: DC 9V 1A Standby Current: 15mA Alarm Current: 300mA Wireless Frequency: 315 MHz, 433 MHz (optional) Volume: 120dB (factory Default Alarm Sounds 180 Seconds) Standby Time: 15 Hours (full Charge) Input Voltage: AC 100~240V 50 / 60Mhz Operating Temperature: -10-50 Degrees Celsius Packing Size: Approx.16*12*10cm/6.3*4.7*3.9in Weight: Approx.400g/14.1oz Package Includes: 1 * Wireless Siren 1 * Power Adapter 1 * Manual . Your order will be shipped from abroad so please allow the necessary time of at least 14 work days for delivery due to ongoing delays in postal deliveries globally.