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. The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom's policies and EU Product Safety and Compliance laws.