2 In1 Bluetooth Sleeping Headphones Wireless Music 3D Sponge Eye Mask Specification: Bluetooth version: 5.0 Bluetooth transmission distance: 10M Music playing time: Maximum sound 7h, medium volume 10 hours Microphone distance: 1m Bluetooth standby time: 72h Battery capacity: 150mA / h Battery power: 0.55w Horn impedance: 32 ohm Horn power: 0.02w Frequency range: 2.4-2.4835ghz Sensitivity: 45dB Transmitting power: 6dB Audio output distortion: 0.6% Audio output SNR: 93dB Charging time: 1-2 hours Maximum input voltage: DC 5V Maximum input current: 150mah Maximum input power: 0.55w Size: 45cm * 11cm (unfold) Packaging: 1 x Bluetooth Sleeping HeadPhones Features: 1. Bluetooth Sleeping headphones is made of durable braided cord and offer a breathable mesh lining, extremely stretchable, fit most head size, what is more, it's incredibly soft and hypoallergenic. 2. Sleep headphones bluetooth built-in 2 ultra-thin speakers, devices control module is in the middle of bluetooth sleep headband, no press the ears. Sleeping headphones are comfortable enough to wear while lying down or sleeping on your side. Choose sleeping bluetooth headphones, fall asleep fast, stay asleep and have a sweet dream, they block out ambient noise without using earplugs that are painful and fall out. 3. Our bluetooth headphones built-in advanced rechargeable lithium battery, which can work more than 10 hours and 2-2.5 hours charging time only. Bluetooth sleep headphones feature Bluetooth 5.0 version with quality chip, fast paring speed, less power consuming,ensure stable clear sound and lossless music even the headphones are in the sports headphones. Note Due to photo lighting problems, the color of the picture may be slightly different. Due to manual measurement, the size may have an error of 1-2cm.