Automatic Cat Toy is USB chargeable which saves you from the hassle and costs to replace batteries. Size: 35.00X21.00X4.00cm; the good technology and simulation design to make this flopping lobster toy look lifelike. Easy to clean. The battery can be removed for easy cleaning of the toy. Instructions for use of pet lobster toys Note: This electronic lobster cat toy will vibrate with each tap. It does not vibrate all the time. Easy to use: 1. Take out the motor at the bottom of the "lobster" toy to turn on the switch; 2. Tap the back of the toy again to trigger the motion sensor; 3. The toy has 3 vibration modes, and the vibration time of each mode is 11-15 seconds; 4. After each vibration, you need to tap the toy again to trigger other modes; 5. The toy can be charged via USB. If there is no response when you tap the toy, you can take out the movement to charge first. When charging, the red light will be on; 6. The movement has been upgraded, the toy can be charged for 20 minutes and can run for 15-20 minutes.