Not too Tall Not too tight the "justright" is perfect from running the mountains to running around town, this is a go to hat with simple colors ways. Medium weight is perfect for fall, winter, spring.

Technical Data

Bluetooth: Vimicro 4.1

Frequency: 2.402GHz-2.480GHz

Transmission distance: 10M or so

Transmission distance of MIC: ≤ 1M

Battery: 3.7V/180mA 

 Charge voltage: DC4.2V~ 5V 

 Charge time: 2~3 hours 

 Play time: around 6-9 hours

Speaker Diameter: 30mm  Magnet Type: NdFeB  Frequency Response: 20-20k Hz  Impedance: 16 ohms  Micro USB Charge