What's in the box:

KST-900 Wireless Bluetooth Over-ear Headphones (Standard)

KST-900 is a high-performance and multifunctional headset. It can be used both wired (via the 3.5mm audio cable) and wireless (via Bluetooth). With a high-quality microphone, the headset supports hands-free calls. The special speakers transmit powerful bass and perfect sound to your ears. KST-900 over-ear styling headset is stable, lightweight, and comfortable.

Features:
[Wireless Connection] Easy to pair with almost all Bluetooth-enabled audio devices to enjoy wireless stereo music.
[3.5mm Wired Connection] With a 3.5mm audio jack, it can connect to a variety of music players (Such as MP3 / MP4, etc) without Bluetooth function.
[Hands-free Calling] high-sensitive microphones reduce ambient noise and grasp the detail of voice, offering high-quality hands-free phone conversation.
[Long Duration Time] Built-in rechargeable 180mAh Lithium battery lasts more than 6 hours of Playing Time and more than 180 hours of Standby Time per charge cycle.
[Ergonomic design] Adjustable headband length, super soft rotating earmuff, comfortable to wear, and easy for storage.

Note:
When using the headset as a wired headset, the microphone can't work and headphone keys are useless.

Specifications:
Model Number: KST-900
Type: Over-ear Stereo Bluetooth Headphone with Mic
Bluetooth version: 3.0+EDR
Transmission Distance: up to 10m
Frequency Response: 20Hz-20KHz
Resistance: 32ohm
Speaker Diameter: 40mm
Sensitivity: 100dB5dB
Rechargeable Li-polymer Battery: 180mAh
Playing Time: 6 hours (depends on the volume)
Charge Time: 1.5-2 hours
Audio Input: 3.5mm Audio Port
Color: Black
Main Item Size: 18.8 * 17.0 * 7.3cm / 7.40 * 6.69 * 2.87in
Main Item Weight: 141g / 4.97oz
Package Size: 22.5 * 19.5 * 4.8cm / 8.85 * 7.67 * 1.89in
Package Weight: 283g / 9.97oz

Package list:
1 * Bluetooth Stereo Headset
1 * USB Cable
1 * Audio cable
1 * English User Manual