Anti-slip and anti-sweat silicone material. Mini program and APP game interaction. Long lasting battery life. Data can be stored in the cloud. Bluetooth connection to mobile phone APP. Product name: Intelligent silicone grip ring Battery type: lithium-ion polymer battery Battery capacity: 60mAh Input voltage: 5V- 2A Product size: 80x30x87mm Product line size: 155mm Product line: 287mm Interface: TYPE-C Display mode: LCD Due to different product batches, the appearance may be different, which does not affect use. Colour:Blue Material:Silica gel Package Contents: 1 x Tuya Smart Grip Strength Trainer Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.