1. Powered by USB rechargeable lithium battery, it can last for about 40 hours after being fully . 2. Use USB cable to connect the glasses for charging. 3. BT Bluetooth signal transmission. Applicable to: and 3D projectors with Bluetooth 3D signals for LeTV X3-50 for 17TV55S9i and 17TV55i Compatible with: for , for , for , for , for , for , for and other Bluetooth 3D Applicable for 3D Bluetooth projectors Applicable for models HW48ES/HW68ES/VW328ES/VW528ES/VW558/VW328/VW268/-VW300ES/VW500ES/VW350ES/VW1100ES Applicable to the following domestic : 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 Home Cinema 5030UB for Home Cinema 2030UB TW9100, 5020E, 6020... 3D that support Bluetooth technology Colour:Black Material:ABS Package Contents: 1 * 3D glasses 1 * glasses cloth 1 * charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.