Ready to go: foldable design allows you to fold the headphones down to a compact travel size if you need to put it in your bag or backpacks. Wide compatibility - Bluetooth 5.0 technology for fast and stable connection to a wide range of Bluetooth-enabled devices. Wireless connection range up to 30 feet. Compatible with all smart phones, tablets, pcs and mp3s. Specifications - model: treble 1200, Bluetooth version: 5.0, standby time: 300 hours, music play time: upto 12 hrs, wireless range: 33ft (10m) Bluetooth protocol: a2dp, AVRCP, HSP, HFP, charging time: 1.5 hours, battery capacity: 300mah.