The Sennheiser HANDMIC DIGITAL is a dynamic, handheld microphone which sports analog/digital conversion from Apogee, a company well-regarded for its AD/DA conversion. Sporting a dynamic capsule and operating in a cardioid polar pattern, the microphone is suitable for speech and instrumental recording, while its mobile features (it's compatible with your iOS devices, after all), render it useful for recording interviews on location, whether indoors or outdoors.
Concrete design attributes render this task achievable, such as an internal shockmount that reduces handling noise, making the mic suitable for handheld interviews, as well as a polar pattern that ensures off-axis rejection; in other words, the capsule will prominently record audio fed directly into it, and little from the sides. The microphone is also immune against cellphone radiation, which can often introduce unpleasant sonic artifacts into the recording. With a frequency response of 40 Hz to 16 kHz, you'll be sure to pick up the nuances of the human voice and various instrumental sound sources.
With onboard digital conversion, you'll obviate the need for a preamplifier, recorder, or interface, and will be free to record straight to your iOS device or computer. Apogee PureDigital A/D conversion is provided for this task, operating at 16-/24-bit resolutions and sample rates of 44.1 to 96 kHz to ensure quality recordings. The microphone draws power straight from your computer or iOS device, so batteries or phantom power aren't required. With your purchase of the HANDMIC DIGITAL, you'll get two different cables (one micro-USB to USB, one micro-USB to lightning), a microphone clamp, a table stand, and a convenient carry pouch.
