Newly developed O13mm dual magnetic drive unit with precision moving large diameter drive unit, Provides a compact, low-frequency, multi-transformation diaphragm for subwoofers that exceed the drive unit's caliber Airflow low-frequency air hole system, which is equipped with air holes at the optimal position for single characteristics. Finely control the air elasticity inside the casing to improve the low frequency output efficiency The tough box design of aluminum alloy integrated cutting can suppress resonance and reduce distortion https://i.imgur.com/PFjDBdS.jpg 【Product specifications】 Type: moving coil type Impedance: 17Ω Drive unit: O13mm Weight: about 10g (without wire) Outer package size: about 8.5x15x4.5/cm Output sensitivity: 109dB/mW Wire: 1.2m (Y type ※) ※ The length of the left and right wires Frequency response: 5 ~ 26,000Hz Plug: O3.5mm gold-plated stereo mini plug (L type) Maximum withstand power: 100mW ● Accessories: Carrying bags, earplugs (XS, S, M, L) ● Replacement earphones (sold separately): ER-CK50 (XS, S, M, L) [Product Warranty] Non-human damage to the original factory warranty for one year [Returns need to know] 1. In accordance with the provisions of the Consumer Protection Law, consumers are entitled to the seven-day appreciation period of the goods (the non-trial period of the appreciation period). The earphones are classified as personal hygiene products, and they are deemed to be purchased when unpacking. Be sure to think twice before ordering or unpacking the goods. In order to avoid affecting their rights and interests 2. The return limit is brand new and unopened. 3. In case of new products, please inform the customer service to handle it for you. 4. New product 瑕疵 exchange, please keep the outer packaging and contents of the accessories intact, if the packaging carton is dirty or severely torn, can not be restored to the original state, or the accessories are lost, can not accept the exchange 【Precautions】 1. Bluetooth headset related time varies depending on personal use, phone settings and ambient/temperature 2. Due to differences in computer screen settings and personal perception, the product images of this store are for reference only, subject to the actual product received. 3. If the product specifications are incorrect, they will be based on physical objects. 4. Please follow the operation instructions and precautions in the product manual before use. 5. If there are any errors in the above specifications, the information published by the original factory shall prevail.