Specification: Item Type: Breastfeeding Massager Material: TPR Product Size: Length: Approx. 9 cm / 3.5 inches Width: approx. 7 cm Height: Approx. 3 cm / 1.2 inch (manual measurement, there will be an error of 0-0.5 cm). Function: vibration, heating Battery type: lithium battery (comes with built-in battery) Battery Capacity: 1500mA Charging time: 5 hours Use time: 4 hours Usage: 1. Low heat start, when you need more heat, you can switch to high heat. 2. Massage pads can be placed on different parts of the chest. 3. To avoid burns, the heating time should not exceed 10 minutes. 4. Press and hold the "heat button" for 2 seconds, open, close. Short press to switch between 3 heating modes. Green light indicates low temperature heating; blue for medium temperature; Red indicates high temperature heating. 5. Long press the "massage button" for 2 seconds, open, close. Short press to switch between 5 massage modes. 6. Short press the "massage level adjustment button" to adjust the level of different massages. Each massage mode has 5 gears. 7. Heater and level indicator light up red during charging. Fully charged will show green. When the battery is low, the red light will flash. 8. Automatically shut down after 30 minutes of use. Package List: 1 massager 1 x charging line 1* Instruction Manual Note: 1. Do not use while sleeping. 2. Do not use on babies. 3. Do not use if internal heating accessories are exposed. 4. Check the skin under the pads frequently to avoid burns and blisters