This is a set including the main unit, a universal case, and a USB cable. I confirmed it works with an iPhone. The inner mesh is slightly discolored, but it functions well. Headphones Type: Closed, Dynamic Driver Unit: 40mm dome type Sensitivity: 97dB/mW (wired connection, POWER ON at 1kHz), 98dB/mW (wired connection, POWER OFF at 1kHz) Frequency Response: 7 Hz - 20,000 Hz (JEITA) Impedance: 22ohm (wired connection, POWER ON at 1kHz), 48ohm (wired connection, POWER OFF at 1kHz) Weight: *2 Approximately 240g Headphone Section (Other) Power: DC 3.65V: Built-in rechargeable lithium-ion battery Charging Time: Approximately 7 hours Charging Method: USB charging Battery Life (Continuous Audio Playback Time): Approximately 35 hours (BTNC) Battery Life (Continuous Talk Time): Approximately 35 hours (BTNC) Battery Life (Standby Time): Approximately 200 hours (BT: ON / NC: OFF) Frequency Characteristics: 20Hz-20,000Hz (wired connection, POWER ON) Supported Impedance: 22ohm (wired connection, POWER ON at 1kHz), 48ohm (wired connection, POWER OFF at 1kHz) Maximum Input: 100mW (when wired) Audio Input Terminals: Micro USB, Stereo mini jack Microphone Section Type: Electret condenser type Directivity: Omnidirectional Bluetooth Communication System: Bluetooth standard Ver. 4.1 Output: Bluetooth standard Power Class 2 Maximum Communication Distance: Approximately 10m Frequency Band: 2.4GHz band (2.4000GHz-2.4835GHz) Modulation Method: FHSS Supported Bluetooth Profiles: *3 A2DP (Advanced Audio Distribution Profile), AVRCP (Audio Video Remote Control Profile), HFP (Hands-free Profile), HSP (Headset Profile) Supported Codecs: *4 aptX, aptX HD, AAC, SBC Content Protection: SCMS-T method Transmission Band (A2DP): 20Hz - 20,000Hz (when sampling frequency is 44.1kHz)