First, the product description Name: A7-TWS Bluetooth Headset, Product Model: A7. The product is equipped with a charging box with 300mAH. Adopting the WT200U V4.2+EDR high-version low-power core Bluetooth chip, it is backward compatible with various protocol functions of 4.0 and 3.0. Compared with the old version, compatibility, stability, functionality and other aspects have been significantly improved.  Second, the parameter specifications 1. Bluetooth chip and Bluetooth version: WT200U low power core V4.2+EDR 2. Bluetooth protocol: HSP1.2, HFP1.6, A2DP1.3, AVRCP1.5 3. Power Input: 3.2V-4.2V 4. Output: 30mW 5. Load condition (Load): 32Ω /φ8 6. Power rating: 74mW 7. Headphone battery: single side 50mAH, battery type 501215 plus protection board polymer battery 8. Charge box battery: 300mAH, battery type 502035 plus protection board polymer battery 9. Charging power: headphone 5V/120mA, charging box 5V/320mA 10. Transmission distance: 10 meters 11. Frequency: 2.4GHz-2.48GHz 12. Talk time: up to 4 hours 13. Listening to the song time: up to 3 hours 14. Standby time: about 150h 15. Single earphone weight: 6g; charging box weight: 44g Headphones single weight (pair, without base): 10.8g; Headphone single weight (including base): 54.3 g; Headphones with packaging package weight: 96.3 g; Headphone packaging size: 11CM*7.6CM*4CM; The weight of the outer box: 0.6kg; Outer box size: 53CM*29CM*37CM; The number of FCL: 150pcs; Net weight of the whole box: 14 kg; FCL gross weight: 14.6 kg.