IK Multimedia iRig Pre 2, Microphone preamplifier for iOS and Android devices, Compatible with iOS and Android devices and digital cameras, 3.5 mm TRRS auto-sense output (TRS compatible) with 40 cm cable length, 48 V phantom power (powered by 2 AA batteries), Gain control, Adjustable 3.5 mm headphone output, Frequency range: 20 - 20,000 Hz, Operating time: 30 hours / 10 hours with phantom powering, Dimensions (W x H x D): 40 x 110 x 34 mm, Weight: 75 g (without batteries)