$14.99$29.99See at Amazon.com
ULBRE Cello Finger Grip + External battery case, was successfully funded on Kickstarter, and is ready for Amazon buyers now. Technical Specifications: Battery: Li-polymer 3.7 Volt Capacity: 4000 mAh Recharging Time: 3 hours (approx.) · Input Current: 1A Output Current: 1A Size: 106mm(L) x 65mm(W) x 8.7mm(H) Weight: 75 grams (approx.) Finger Grip Ring: Metal Kickstand Holder Material: Genuine Leather+Aluminum Metal Battery Protection: Over-temperature cut-off during charging; Over-charging and discharging cut-off protection; Short circuit protection.