Bluetooth Headphones with Microphone custom belt Increase in muscle endurance and

Increase in muscle endurance and muscle output

not the Metallica song

Nubs & grooves on roller kneads

no tangle and no need to worry about bearings coming loose or falling off

Bluetooth Headphones with Microphone custom belt Increase in muscle endurance andSPECIFICATIONS talk time: as long as 18 hours other function: TF card playing(excluded TF card) With Microphone: Yes Wireless type: Bluetooth V5. 0 Wireless Type: bluetooth Waterproof: No Volume Control: Yes Vocalism Principle: Dynamic Total Harmonic Distortion: 0. 3% Support Memory Card: Yes Support APP: No Style: Headphone Sensitivity: 84dBdB Resistance: 32 Range: 33 Feet about 15 Meters Plug Type: Line Type Playback time: about 20hours Package