1. Powered by USB rechargeable lithium battery, it can last for about 40 hours after being fully charged. 2. Use USB cable to connect the glasses for charging. 3. BT Bluetooth signal transmission. Applicable to: TVs and 3D projectors with Bluetooth 3D signals for LeTV X3-50 for Lenovo 17TV55S9i and 17TV55i Compatible with: for Epson, for Samsung, for Sony, for Sharp, for Toshiba, for Konka, for TCL and other Bluetooth 3D TVs Applicable for Epson EPSON 3D Bluetooth projectors Applicable for Sony models HW48ES/HW68ES/VW328ES/VW528ES/VW558/VW328/VW268/VPL-VW300ES/VW500ES/VW350ES/VW1100ES Applicable to the following domestic licensed products: CH-TW5200 EH-TW5210 EH-TW5300 EH-TW5350 EH-TW6200 EH-TW6600 EH-TW5810C EH-TW6510C EH-TW6515C EH-TW8510C EH-TW8515C EH-TW9510C EH-TW7510C EH-TW5910 EH-TW560C Also applicable to the following foreign regular models: EH-TW3020 EH-TW3020E EH-TW5020UB EH-TW5020UBE EH-TW6010 EH-TW6100 EH-TW8100 EH-TW510 EH-TW5200 EH-TW550 EH-TW8200 EH-TW7200 EH-TW9200 for EPSON Home Cinema 5030UB for EPSON Home Cinema 2030UB TW9100, 5020E, 6020... 3D TVs that support Bluetooth technology Colour:Black Material:ABS Package Contents: 1 * 3D glasses 1 * glasses cloth 1 * charging cable