Features:  • One add-on mini hidden audio board for all cameras which need audio function. • High sensitive microphone with 50cm power/audio cable. • Easy to install and ideal for all security surveillance needs.   Technical Specifications:  • AUDIO OUTPUT: Max 2 V p-p • MICROPHONE SENSITIVITY: -66dB±3dB • POWER SUPPLY: 12 VDC (+ / - 0.5V) • POWER CONSUMPTION: 10 mA • DIMENSIONS W x H x D mm.: 24*8*515 mm (Audio Box) • WEIGHT g 25 g • STORAGE TEMPERATURE: –30°C to +60°C • OPERATING TEMPERATURE: –10°C to +45°C