The Apollo 7 is truly one-of-a-kind. As the world's most compact true wireless headphone we created a wireless headphone that offers incredible sound. Built with Bluetooth 4.1 and coated with a nano coating technology to make the Apollo 7 waterproof, this earphone only weighs 4 grams. Comes with a sleek aluminum rechargeable case with a built in lithium battery. Features True Wireless:Completely tangle-free stereo sound wherever you go without annoying cables to tie you down Bluetooth 4.1:Full support for advanced AAC, SBC, and aptX audio standards Ultra Light, Low Power Consumption:Barely there feel at 4g, including an omnidirectional microphone Single Touch Multi-function:With a single button you can power on/off, take a call, play music, skip tracks, change volume or even access Siri easily by tapping, holding, or double-tapping on the button Microphone:Unlike most other similar sized earphones on the market today, we integrated a MEMS omnidirectional microphone with an input sensitivity of -42dB (+/- 2dB). This allows for a crisp, clear hands free solution on the go Waterproof:Earphone nano-coating offers excellent liquid protection Voice:Apollo 7 works with both Siri and Google Now. Activate it anytime, anywhere Sound Isolation: Foam Tips seals ear canal from environmental distractions with heat activated memory foam that expands to every unique ear canal shape, creating a custom secure fitTechnical Specifications Wireless Range: 30 Feet Battery Capacity: Earphone (50 mAh) Charging Case (300 mAh) Driver Size: Ø 5.8 mm Micro Driver Sensitivity: (dB/mW): 100 Frequency: 20Hz ~20KHz Impendence: (Ohm) @ 1kHz: 16 Microphone: MEMS Omni Directional -42dB (+/- 2dB) Water Proof: Nano Coating IPX5