1. Powerful solar panels(noncrystalline silicon), recharges itself in indoors and outdoors 2. Built-in wireless bluetooth 3.0 version; 3. Operating distance:¡§q10 meters; 4. Built-in rechargeable ni-mh battery 80mah; can work about 40 hours after full charge; charging time 6-7 hours 5. Energy saving sleep mode ; 6.Compatible with ipad2/ipad3 & other devices support bluetooth 7.White & black 8.Ultra-thin design, very portable 9. Size: 248*189.5*11mm. Net weight:420g 10.Accessories:soft touch stylus+user guide Size: 248*189.5*11mm. Net weight:420g