Bluetooth version: 5.0 Battery capacity: 3.7V polymer lithium battery 500mAh Speaker: 6 Ω 1.5W (dual speakers) Effective distance: ≥ 10M Play duration: ≥ 15H Charging time: 1 hour Charging input: TYPE-C 5V0.4A Frequency range: 20MH-20kHz Sound: Built in special customized bone conduction transducer Bone conduction transducer: built-in enhancement chip and high-performance coil Function: Built in seven types of white noise playback, Bluetooth connection playback Material: ABS Color: White, Pink, Black