| Driver Diameter | Balanced armature |
| Maximum Input Power | 3 mW |
| Sensitivity | 104 dB/mW |
| Impedance | 30 ohms |
| Cable | 1.2 m (4 ft), Y-type |
| Connector | 3.5 mm (1/8") mini stereo, gold-plated |
| Accessories Included | Hard case; interchangeable earpieces (S, M, L) |
ATH-CK9 : In-Ear Headphones
ATH-CK9BK In-ear Headphones (black)
ATH-CK9WH In-ear Headphones (white)