Energy Sistem Space Power Bluetooth headphones with built-in FM

45 h of music with Bluetooth® technology, FM radio and MP3 player via Micro SD cards. Audio: Driver diameter: 40 mm Type: Dynamic Frequency response: 20 Hz ~ 20 kHz Headphone type: Over-ear design Connectivity: Voice assistant (Google, Siri): Yes Bluetooth version: 5.1 Bluetooth - Frequency band: 2.4 GHz Bluetooth profiles: A2DP / AVRCP / HFP / HSP Bluetooth range: 20m Battery: Type: LiPo Capacity: 1200 mAh Voltage: 3.7 V Battery life - Normal use: 45 h Charging time: 4 h Microphone: Hands-free: Yes Microphone - Type: Built-in Microphone - Sensitivity: -38 dB ± 3 dB (@1 kHz) Frequency response: 100 Hz ~ 10 kHz Compatibility: Compatibility: Mac / PC Windows / Smartphone / Tablet / TV FM Radio: FM radio: Yes FM radio - Auto search: Yes FM radio - Frequency range: 87,5 ~ 108 MHz External memo