Sleep Sound Anywhere & Anytime: Wear this incredibly lightweight, soft, comfortable sleep mask anywhere - in a bed, on a flight, on a long car ride, while camping - and enjoy uninterrupted, deep, relaxing sleep. This silk eye sleeping mask is perfect for Travel, Home, Flight, Train or anywhere where your sleep is bothered by light.Specification:Product Name:Bluetooth sleep eye maskBluetooth protocol: V5.0Frequency range: 20HZ-20KHZCharging voltage: 3.7V-4.2VCharging current: 150-200mASensitivity: 88DMSignal to noise ratio: 90dBSpeaker impedance: 32QΩ+15%Speaker specification: 30mmOperating range: 10MCharging time: 2HUse time: 10HBattery capacity: 200mA lithium batteryBluetooth support type: HFPV1.5/A2DPV1.2/AVRCPV1.4/GAVDP v1.2/AVDTP v1.2/SPP v1.2/AVCTP v1.3Material: Polyester + CottonSingle product weight: 160gPrecautions：Wash in water at room temperature, do not bleach, hang to dry, ironing temperature of the soleplate does not exceed 110 degrees, can be dry cleaned, pay attention to wash separately from other colored clothing.Package Includes:1 x Bluetooth eye mask1 x USB CableAccessories – Sleep mask comes with premium earplugs and a cloth bag, making it easy to store and travel with. An ideal gift for Valentine's Day, Mother's Day, Christmas, Birthday, for kids, adults, couples.Thank you for your patronage. I sell products with integrity. If you have any questions, please contact me in time. We will solve it for you within 24 hours.