Item Type: Audio Baby Monitor Operating Frequency: ISM 905-925MHZ Power: 10dBm Modulation Mode: FSK Spread Spectrum Method: FHHS Audio Coding: ADPCM Modulation Frequency: 180KHz Sensitivity: Less than or equal to -92DBM Applicable Voltage: 100-240V Plug Specification: US Plug Battery Type: 3 x 1.2V AAA batteries(not included) Material: Plastic and electronics Open Space Transmission Range: Approx. 300meter / 984.3ft1SAFE TRANSMISSION: Wireless digital encryption transmission, safe and reliable, working band from 905?925MHz 2FLEXIBLE AND ADJUSTABLE: Two way intercom, level 10 volume adjustable, open space transmission range up to 300meter 3MULTIPLE FEATURES: Built in music and small night light that can be turned on or off in both directions 4TECHNICAL PARAMETERS: Power for 10dBm, modulation frequency is 180KHz, sensitivity less than or equal to -92dBm 5STABLE AND DURABLE: Applicable voltage from US plug 100?240V, come with stable structure, excellent performance and long service life 2 x Machine 2 x Power Adapter