Materials: Body-safe silicone/ABS. Battery: Li-Ion 500mA 3.7V. Charging: 2h at 5.0V. User Time: 2 Hours. Standby Time: 90 days. Frequency: 120Hz. Max. Sound level: <50dB. Interface: 4-button interface. Free Tester with purchase over $350.00 net of LELO products. Tester, must be ordered at time of purchase. Tester does not include charger.