2 PCS Wireless Bluetooth Headphone Silicone Anti-Lost Protective Cover For Sony WF-SP800N(Red) Main-Computer & Networking Another reason is that the

Another reason is that the battery voltage is too low

Button life: 10 million times

Heating method: constant temperature heating

Optical resolution: 1200dpi

Decode ability: 4*1080N@12fps

2 PCS Wireless Bluetooth Headphone Silicone Anti-Lost Protective Cover For Sony WF-SP800N(Red) Main-Computer & Networking Another reason is that the1. Material: silicone 2. Style: flip type 3. Flat bottom, stable and not easy to fall 4. Anti shock and anti drop, buffer impact force 5. Applicable products: For Sony WF SP800N Bluetooth headset 6. The real machine is opened, reserved holes, and can be charged without removing the case 7. The surface is sprayed with skin friendly oil, no fingerprints, no ash, super dirt resistant 8. Comes with hooks to prevent loss when going out, and can be hung on