... Two types of cameras for your choice: wireless hidden camera and mini button camera13). Wireless receiving frequency: 2.4GHz, 8 channel ... 1, MPEG-4, AVI, ASF, ADPCM Audio Play Format: Support MP3, MP2.5 Photo format: JPG, JPEG, TIF, TIFF formatInterface: ... :85*54*17mmPictures of wireless hidden camera:Pictures of mini button camera: 2.4GHz 8CH usb wireless mini dvr receiver with mini hidden camera