SENECESLI Smart CounterRing - 18MM

"Specification: Item Type: Finger Counter Material: Aluminum Alloy Color: Graphite Battery Type: Built in 40mAh lithium ion battery Matching System: For Android 5.1 or for 10.0 or higher Screen: Organic light emitting diode 0.49 inches, 72 x 40 Charging Port: For Pogo Pin Sensor: Vibration motor How to Use: Use upon startup, please refer to the manual for details. Packing List: 1 x Finger Counter 1 x Manual 1 x Charging Cable 1 x Charging Storage Box"