Adjustable and long playback time: 20-27 inches in length, adjustable to different head sizes. Has a built-in 200 mAh high performance battery.

Powerful Bluetooth technology: this mask can be easily paired with any smartphone. It uses Bluetooth 5.0 technology. It can be connected to a TV, iPhone, iPad, Android phone, computer, etc.

Specifications:

Type:: Bluetooth sleep mask

Feature: Hands free Bluetooth earphone 

Compatible system:: IOS, Android, Windows

With Microphone: Yes

Wireless Type: Bluetooth

Waterproof: No

Volume Control: Yes

Supports Memory Card: No

Support APP: Yes

Sensitivity: 120±2dB

Resistance: 32Ω

Max Output: 0.05mW

Impedance Range: up to 32 Ω

Frequency Response Range: 20 - 20000Hz

Earcups Type: Sealed

Control Button: Yes

Charging Method: Cable

Bluetooth Version: 5.0