1. Built in Music: Built in 20 white noise and 4 sleep music, stereo sound. White magnetic horn, shock bass. The position of the headset can be adjusted to suit different people's head circumference 2. Large Capacity Battery: The sleep eye cover has a full capacity battery of 180mAh, which guarantees 10 hours of continuous music playing 3. Fast Transmission Rate: Using V5.2 chip, the transmission rate is fast and stable, the transmission distance is more than 20 meters 4. Voice Prompt: The sleep eye cover has English voice prompts for power on, power off, successful pairing, and maximum volume. For iOS system can display battery power and activate the Voice Application Intelligent assistant 5. Excellent Light Blocking Effect: Sleep eye cover adopts personality design, excellent light blocking effect. You can also put hot compress pack, cold ice pack in it Specification: Item Type: Sleep Eye Cover Material: Polyester Fiber Weight: Approx. 116g / 4.1oz Usage: Headwear Battery Capacity: 180mah Battery Type: Lithium Battery (Shipped with Built in Battery) Charging Mode: USB Powered Charging Time: About 2 Hours Running Time: 10 Hours Specifications: V5.2+EDR/HSP/A2DP/AVRCP/HFP Frequency Range: 2.402GHZ to 2.480GHZ Transmission Distance: 20m / 65.6ft Sound Channel: Stereo Horn Parameters: 32O 30mm / 1.2in Horn Power: 10 Milliwatt X2 Signal to Noise Ratio: 105DB Functions: Previous Song, Song, Volume Up, Volume Down, Play, Pause, Answer a Call, Make a Call, Activate Voice APP, Microphone Talk How to Use: On off: Long press play or pause button, on or off Adjust the volume: Press + to increase the volume and - to decrease the volume To switch songs: Long press + to the track, long press - to the last track packing list: 1 X Sleep Eye Cover 1 X USB Charging Cable 1 X ManualExcellent Light Blocking Effect: Sleep eye cover adopts personality design, excellent light blocking effect. You can also put hot compress pack, cold ice pack in it. Fast Transmission Rate: Using V5.2 chip, the transmission rate is fast and stable, the transmission distance is more than 20 meters. Voice Prompt: The sleep eye cover has English voice prompts for power on, power off, successful pairing, and maximum volume. For iOS system can display battery power and activate the Voice Application Intelligent assistant. Built in Music: Built in 20 white noise and 4 sleep music, stereo sound. White magnetic horn, shock bass. The position of the headset can be adjusted to suit different people's head circumference. Large Capacity Battery: The sleep eye cover has a full capacity battery of 180mAh, which guarantees 10 hours of continuous music playing.