wind resistant automatic volume adjustment multipoint technology for connecting 2 bluetooth mobile phones bluetooth specification v2.1+edr class 2 supports bluetooth headset, handsfree, and hid profiles rechargeable 130 mah li-polymer battery talk time: up to 5 hours standby time: up to 100 hours nominal charging time: within 3 hours laser pointer operating time: up to 3 hours compatible with i.tech 110 - 240vac switching mini usb charger dimensions: 63 (l) x 16.5 (w) x 9.8 (h) mm weight: 12 grams parallel imported warranty: warranty one year delivery within 2-4 business days