Specification: Lie flat Length: 135mm Width: 56mm Height: 15mm bending Length: 123mm Width: 56mm Height: 29mm Net weight: 51g Material: Silicone + ABS Transmission method: Bluetooth 4.0 and 5.0/3.0 Lighting: None Button: 3 Transmission distance: 10 meters Power supply: No. 7 battery Packing method: carton pack without electricity Whether to mute: Yes Applicable system: all support Go to sleep: within 30 seconds Wake up: touch the button Operation method: Bluetooth connection Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.