Information on Sony Wireless In-Ear Headphones (WI-C400/BZ) - Black:

Model Number WI-C400/BZ
Brand SONY
Article Number 611947

General
Colour Black
Accessory For Phones, Tablet
Product Type Earphones
Compatibility Universal
Compatibility Details Bluetooth-enabled smartphones
Additional Features Usage Time: Max. 20 Hrs | Charge Time: Approx. 4.5 Hrs | Wearing Style: Behind-the-neck
Connection Wireless
Connection Details Bluetooth
Water Resistant No
Water Proof No
Noise Cancellation No
Frequency Response 8–22,000 Hz
Microphone -
Battery Life Up to 20 hours
Weight Approx. 1.23 oz (35 g)